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| product structure silicon monolithic integrated circuit ? this product is not designed prot ection against radioactive rays 1/32 tsz02201-0g3g0c400170-1-2 03.dec.2012 rev.001 ? 2012 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 k 14 k 001 datashee t 10 f bat ter y vdet sw led1 led2 led3 4.7 h 10led x 6parallel sensp sensn led4 each 20ma 100 m ? rtr02 0n0 5 2 .2 f * rst b pwmpow pwmdrv power on/off 200hz pwm vba t led5 led6 fai lsel g n d 24k ? test gn iseth vreg 1 f isetl gnd gnd 6-channel white led driver for up to 72 leds bd6581gu ? general description bd6581gu is white led driver ic with pwm step-up dc/dc converter that can boost max 42.5v and current driver that can drive max 25ma. the wide and precision brightness can be controlled by external pwm pulse. bd6581gu has very accurate current drivers, and it has few current errors between each strings. so, it will be helpful to reduce brightness spots on the lcd. small package type is suited for saving space. ? features ? high efficiency pwm step-up dc/dc converter (fsw=1mhz), max efficiency 93% ? high accuracy & good matching ( ? 1.5%) current drivers 6ch ? drive up to 12 ? in series, 6 strings in parallel =72 white leds ( ? white led vf=3.5vmax) ? rich safety functions ~ over-voltage protection (ovp) ~over current limit ~ external sbd open detect ~ thermal shutdown ? key specification ? operating power supply vo ltage range: 2.7v ~ 22.0v ? quiescent current 1: 0.6 a (typ.) quiescent current 2: 4.6 a (typ.) ? operating temperature range: -30 ? ~+85 ? ? package w(typ.) x d(typ.) x h (max.) vcsp85h2: 2.60mm x 2.60mm x 1.00mm [bottom view] ? application all middle size lcd equipments backlight of notebook pc, portable dvd player, car navigation systems, etc. ? typical application circuit bd6581gu fi g ure 1. t yp ical a pp lication ci r cuit eled6 led5 led4 led3 led2 d rstb gnd failsel gnd led1 cvbat pwmpow vreg isetl pwmdrv b n.c - test iseth gnd a vdet n.c sw sensp sensn 1 2 3 4 5
datasheet 2/32 bd6581gu tsz02201-0g3g0c400170-1-2 03.dec.2012 rev.001 ? 2012 rohm co., ltd. all rights reserved. tsz22111 k 15 k 001 www.rohm.com ? absolute maximum ratings all middle size lcd equipments backlight of notebook pc, portable dvd player, car navigation systems, etc. parameter symbol ratings unit condition terminal voltage 1 vmax1 7 v test, vreg, sensp, sensn, sw, rstb, pwmpow, pwmdrv, failsel, iseth, isetl terminal voltage 2 vmax2 25 v led1, led2, led3, led4, led5, led6, vbat terminal voltage 3 vmax3 50.5 v vdet power dissipation 1 pd1 1100 mw *1 operating temperature r ange topr -30 to +85 ? - storage temperature range tstg -55 to +150 ? - *1 this value is the measurement val ue that was mounted on the pcb by rohm. temperature deleting: 8.8mw/ ? from ta>25 ? ? recommended operating rating (ta=-30 ? to +85 ?) parameter symbol limits unit condition min. typ. max. power supply voltage vbat 2.7 12.0 22.0 v ? electrical characteristic (unless otherwise specified, vbat=12v, rstb=2.5v, ta = +25 ?) parameter symbol limits unit condition min. typ. max. [failsel,pwmdrv terminal] en threshold voltage (low) vthl 0 - 0.2 v en threshold voltage (high) 1 vthh1 1.4 - 5.0 v vbat>5.0v en threshold voltage (high) 2 vthh2 1.4 - vbat v vbat<5.0v en terminal input current iin - 8.3 14.0 a input=2.5v [pwmpow terminal] low input voltage range pwml 0 - 0.2 v high input voltage range1 pwmh1 1.4 - 5.0 v vbat>5.0v high input voltage range2 pwmh2 1.4 - vbat v vbat<5.0v pwm pull down resistor pwmr 300 500 700 k ? [rstb terminal] low input voltage range rstbl 0 - 0.2 v high input voltage range1 rstbh1 2.25 2.5 5.0 v vbat>5.0v high input voltage range2 rstbh2 2.25 2.5 vbat v vbat<5.0v current consumption irstb - 89 134 a rstb=2.5v, led1-6=3v [regulator] vreg voltage vreg 4.0 5.0 6.0 v no load under voltage lock out uvlo 2.05 2.25 2.65 v datasheet 3/32 bd6581gu tsz02201-0g3g0c400170-1-2 03.dec.2012 rev.001 ? 2012 rohm co., ltd. all rights reserved. tsz22111 k 15 k 001 www.rohm.com ? electrical characteristic ? continued (unless otherwise specified, vbat=12v, rstb=2.5v, ta = +25 ?) parameter symbol limits unit condition min. typ. max. [switching regulator] quiescent current 1 iq1 - 0.6 3.4 a rstb=0v, vbat=12v quiescent current 2 iq2 - 4.6 10 a rstb=0v, vbat=22v current consumption idd - 3.4 5.1 ma vdet=0v,iseth=24k ? led control voltage vled 0.4 0.5 0.6 v over current limit voltage ocp 70 100 130 mv *1 sbd open protect sop - - 0.1 v detect voltage of vdet pin switching frequency fsw 0.8 1.0 1.2 mhz duty cycle limit duty 92.5 95.0 99.0 % led1-6=0.3v over voltage limit ovl 43.0 44.7 46.4 v led1-6=0.3v [current driver] led maximum current ilmax - - 25 ma led current accuracy ilaccu - - 3 % iled=16ma led current matching ilmat - - 1.5 % each led current/average (led1- 6) iled=16ma iset voltage iset 0.5 0.6 0.7 v led current limiter ilocp 35 60 90 ma current limit value at iset resistance 4.7k ? setting led1, 2, 3, 4, 5, 6=0.5v led terminal over voltage protect ledovp 10.0 11.5 13.0 v rstb=pwmdrv=2.5v *1 this parameter is tested with dc measurement. datasheet 4/32 bd6581gu tsz02201-0g3g0c400170-1-2 03.dec.2012 rev.001 ? 2012 rohm co., ltd. all rights reserved. tsz22111 k 15 k 001 www.rohm.com ? pin descriptions pin name in/out pin number function terminal equivalent circuit diagram a1 vdet in detect input for sbd open and ovp c a2 n.c. - no connect pin f a3 sw out switching tr drive terminal g a4 sensp in + side current sense terminal g a5 sensn in - side current sense terminal a b1 n.c. - no connect pin f b3 test in test input (pull down 100k ? to gnd) g b4 iseth in resistor connection for ,led current setting at pwmdrv=h a b5 gnd - gnd b c1 vbat in battery input c c2 pwmpow in pwm input pin for power on/off e c3 vreg out regulator output / internal power-supply d c4 isetl in resistor connection for ,led current setting at pwmdrv=l a c5 pwmdrv in pwm input pin for power on/off only driver e d1 rstb in reset pin l :reset h :reset cancel e d2 gnd - gnd b d3 failsel in latch selectable pin of protect function e d4 gnd - gnd b d5 led1 in current sink for led1 c e1 led6 in current sink for led6 c e2 led5 in current sink for led5 c e3 led4 in current sink for led4 c e4 led3 in current sink for led3 c e5 led2 in current sink for led2 c ? pin esd type gnd vbat vreg pin a vbat pin b gnd pin c gnd vbat pin d gnd vbat pin e 5.5v clamp pin f gnd vbat pin g vreg figure 2. pin esd type datasheet 5/32 bd6581gu tsz02201-0g3g0c400170-1-2 03.dec.2012 rev.001 ? 2012 rohm co., ltd. all rights reserved. tsz22111 k 15 k 001 www.rohm.com ? block diagram pin number 23pin figure 3. block diagram current sense s q r - + - + over voltage protect sbd open protect vin detector reg internal p ower sup lly vde t sw uvlo rstb 300k ? current driver + - - - led 1 led2 led 3 erramp + + - osc c ontrol se ns e 100k ? pw mcomp test pw mp ow se nsp sensn led4 - 1m ? 10 0k ? led term inal over voltage pro tect 500 k ? vbat vr eg fa ils el pwmdrv - - le d5 le d6 + - pwmdrv=h on iset l resistor driver pwmdrv=l on ise th is etl iset h resistor driver 300 k ? tsd 300k ? gnd gnd gnd gn d led terminal detect datasheet 6/32 bd6581gu tsz02201-0g3g0c400170-1-2 03.dec.2012 rev.001 ? 2012 rohm co., ltd. all rights reserved. tsz22111 k 15 k 001 www.rohm.com ? typical performance curves figure 5. quiescent current vs vbat figure 7. uvlo vs temperature 2.2 2.22 2.24 2.26 2.28 2.3 -30 25 80 ta [ o c] vbat [v] figure 4. current consumption vs vbat figure 6. oscillation frequency vs vbat -30 ? 25? 85? 25? 85? -30 ? 25? -30 ? 85? datasheet 7/32 bd6581gu tsz02201-0g3g0c400170-1-2 03.dec.2012 rev.001 ? 2012 rohm co., ltd. all rights reserved. tsz22111 k 15 k 001 www.rohm.com ? typical performance curves - continued figure 8. efficiency vs pwmpow-hi duty iseth=24k ? , pwm=200hz figure 9. efficiency vs pwmdrv-hi duty i s eth=24k ? , pwm=2 00 hz figure 10. led current vs pwmdrv-hi duty pwm = 200hz figure 11. led current vs pwmdrv-hi duty ( expansion) pwm = 200hz 6v 12v 16v 60% 65% 70% 75% 80% 85% 90% 95% 100% 0 102030405060708090100 efficiency [ ] duty [%] 6v 12v 16v 6v 12v 16v 16v 12v 6v datasheet 8/32 bd6581gu tsz02201-0g3g0c400170-1-2 03.dec.2012 rev.001 ? 2012 rohm co., ltd. all rights reserved. tsz22111 k 15 k 001 www.rohm.com ? typical performance curves - continued figure 12. led current vs pwmdrv-hi duty pwm = 200hz, 1khz,10khz figure 13. led current vs pwmpow-hi duty tpwm = 200hz figure 14. led current vs pwmpow-hi duty ( expansion) pwm = 200hz figure 15. led current vs pwmpow-hi duty pwm = 200hz, 1khz,10khz 0 2 4 6 8 10 12 14 16 18 20 0 102030405060708090100 led current [ma] duty [%] 6v 12v 16v 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 duty (%) led current [ma] 6v 12v 16v 200hz 1khz 10khz datasheet 9/32 bd6581gu tsz02201-0g3g0c400170-1-2 03.dec.2012 rev.001 ? 2012 rohm co., ltd. all rights reserved. tsz22111 k 15 k 001 www.rohm.com ? typical performance curves - continued figure 16. led current matching vspwmdrv-hi duty pwm = 200hz figure 17. led current matching vs pwmdrv-hi duty (expansion) pwm = 200hz figure 18. vout response driver control pwm (pwmdrv) figure 19. led current matching vs pwmpow-hi duty pwm = 200hz datasheet 10/32 bd6581gu tsz02201-0g3g0c400170-1-2 03.dec.2012 rev.001 ? 2012 rohm co., ltd. all rights reserved. tsz22111 k 15 k 001 www.rohm.com ? typical performance curves - continued figure 20. led current matching vs pwmpow-hi duty (expansion) pwm = 200hz figure 21. vout response power control pwm (pwmpow) figure 23. line transient (10v to 22v) figure 22. led current vs temperature pwmdrv=h, iseth=30k ? (16ma setting) 15 .7 0 15 .7 5 15 .8 0 15 .8 5 15 .9 0 15 .9 5 16 .0 0 16 .0 5 16 .1 0 16 .1 5 16 .2 0 16 .2 5 16 .3 0 -3 0 -1 0 10 30 50 70 ledcurrent [ma] temp [ ? ] 2.7v 22v 5v 7v 12v datasheet 11/32 bd6581gu tsz02201-0g3g0c400170-1-2 03.dec.2012 rev.001 ? 2012 rohm co., ltd. all rights reserved. tsz22111 k 15 k 001 www.rohm.com ? typical performance curves - continued figure 24. line transient (22v to 10v) figure 25. vout@ovp ( led open ) datasheet 12/32 bd6581gu tsz02201-0g3g0c400170-1-2 03.dec.2012 rev.001 ? 2012 rohm co., ltd. all rights reserved. tsz22111 k 15 k 001 www.rohm.com ? description of functions 1) pwm current mode dc/dc converter while bd6581gu is power on, the lowest voltage of led1, 2, 3, 4, 5, 6 is detected, pwm duty is decided to be 0.5v and output voltage is kept invariably. as for the inputs of the pwm comparator as the feature of the pwm cu rrent mode, one is overlapped with error components from the error amplifier, and the other is overlapped with a current sense signal that controls the inductor current into slope waveform to prevent s ub harmonic oscillation. this ou tput controls external nch tr via the rs latch. in the period where external nch tr gate is on, energy is accumulated in the external inductor, and in the period where external nch tr gate is off, energy is transferred to the output capacitor via external sbd. bd6581gu has many safety functions, and their de tection signals stop switching operation at once. 2) soft start bd6581gu has soft start function. the soft start function prevents large coil current. rush current at turning on is prevented by the soft start function. after rstb is changed l ? h, when pwmpow is changed l ? h, soft start becomes effective for within 1ms and soft start doesn't become effective even if pwmpow is changed l ? h after that. and, when the h section of pwmpow is within 1ms, soft start becomes invalid when pwmpow is input to h more than three times. the invalid of the soft start can be canceled by making rstb ? l. 3) failsel pin when the error condition occurs, boost operating is stopped by the protection function, and t he error condition is avoided. on that occasion, the way to stop of boost operating by the protection func tion can be selected with failsel pin. details are as shown in figure 26, 27. after power on, when the protection function is operating under about 1ms have passed, the stop state of the boost operating can be held through failsel is h, the stop state can reset through rstb is l. and, boost operating is stopped when the protection function is operating through failsel is l, but when the protection function becomes un-detect, boost operating is started again. it never keeps holding the st op state of boost operating. object of protect function is as shown below. ~ over-voltage protection ~ external sbd open detect ~ thermal shutdown ~ led terminal over-voltage protection ~over current limit figure 26. failsel operating description figure 27. failsel=h light off control in pwm control by pwmdrv can?t use this function. when it is off over 10ms on pwm control by pwmpow usi ng this function, it may be stopped the boost operating as over current protection work at off on pwmpow=l. about 1ms un-operating range fails el rstb protection fu nction normal operating o ff un-detection detection normal o p eratin g boost stop off normal ?l? un-detectio datasheet 13/32 bd6581gu tsz02201-0g3g0c400170-1-2 03.dec.2012 rev.001 ? 2012 rohm co., ltd. all rights reserved. tsz22111 k 15 k 001 www.rohm.com 4) external sbd open detect and over voltage protection bd6581gu has over boost protection by external sbd open an d over voltage protection. it detects vdet voltage and is stopped output tr in abnormal condition. details are as shown below. ~ external sbd open detect in the case of external sbd is not connected to ic, the co il or external tr may be destru cted. therefore, at such an error as vout becoming 0.1v or below, the under detector shown in the figure works, and turns off the output tr, and prevents the coil and the ic from being destructed. and the ic changes from activation into non-activa tion, and current does not flow to the coil (0ma). ~ over voltage protection at such an error of output open as t he output dc/dc and the led is not connec ted to ic, the dc/dc will boost too much and the vdet terminal exceed the absolute maximum ratings, and may destruct the ic. therefore, when vdet becomes sensing voltage or higher, the over voltage limit wo rks, and turns off the output tr, and the pressure up made stop. at this moment, the ic changes from activation into non- activation, and the output voltage goes down slowly. and, when the output voltage becomes the hyster esis of the over voltage limit or bel ow, the output voltage pressure up to sensing voltage once again and unless the application error is recovered, this operation is repeated. 5) thermal shut down bd6581gu has thermal shut down function. the thermal shut down works at 175 c or higher, and the ic changes from activation into non-activation. because non-activation is different from rstb=l, it doesn?t? be reset in side ic. moreover, even if thermal shut down function works, soft start, failsel, selection the number of led lines of the current driver and starting current setting at pwmdrv=l related rstb are hold. 6) over current limit over current flows the current detection resistor that is connected to switch ing transistor source and between gnd, sensp pin voltage turns more than detection voltage, over cu rrent protection is operating and it is prevented from flowing more than detection current by reducing on duty of switching tr without stopping boost. as over current detector of bd6581gu is detected peak current, current more than over current setting value does not flow. and, over current value can decide freely by changing over current detection voltage. datasheet 14/32 bd6581gu tsz02201-0g3g0c400170-1-2 03.dec.2012 rev.001 ? 2012 rohm co., ltd. all rights reserved. tsz22111 k 15 k 001 www.rohm.com (example 2) in case of, vin=12.0v, l=4.7h, fsw=1m hz, vout=39v, iout=80ma, efficiency=85% ipeak = (12.0v / 4.7h) x (1 / 1mhz) x (1-(12v / 39v)) =1.77a iave = (39v x 80ma / 12.0v) / 85% = 0.31a ton = (0.31a x (1-12 v / 39v) x (1 / 1mhz) x ( 4.7h /12 v) x 2) 1/2 = 0.41s (1-vin/vout) x (1 /fsw)=0.69s > ton peak current = 12v/4.7h x 0.41s = 1.05a *when too large current is set, output over shoot is caused, be careful enough because it is led to break down of the ic in case of the worst. ? operating of the a pplication deficiency 1) when 1 led or 1parallel open during the operating in case of failsel=l, the led parallel which became open isn't lighting, but other led parallel is lighting. at that time, output boosts up to the over voltage protection voltage 44.7v so that led terminal may be 0v or it boost to the output voltage that led terminal voltage becomes led te rminal over voltage protection 11.5v or it becomes the output voltage restricted by the over current limit. in case of failsel=h, boost stops when led becomes open and all led turns off the lights. 2) when led short-circuited in the plural in case of failsel=l, all led is turned on unless led terminal voltage is led terminal over voltage protection of more than 11.5v. when it was more than 11.5v only the line which short-circuited is turned on normally and led current of other lines fall or turn off the lights. in case of failsel=h , boost stops at more than 11.5v and all led turns off the lights. 3) when schottky diode came off regardless of failsel, all led isn't turned on. also, ic and a switching transistor aren't destroyed because boost operating stops by the schottky diod e coming off protected function. 4)when over current detection resistor came off regardless of failsel, all led isn't tu rned on. because the resistance of 100k ? is between sensp and sensn terminal, over current protection works in stantly and led current can't be flow. ? control signal input timing in case you input control signs, such as rstb, pwmp ow, and pwmdrv, in the condition that the standup of supply voltage (vbat) is not completed, be careful of the following point. ? input each control signal after vbat exceeds 2.7v. ? please do not input each control sign until vbat ex ceeds hi voltage of rstb, pwmpow, and pwmdrv. ? when you input rstb during the standup of vba t and hi voltage is inputted into pwmpow, please give the standup time to stable voltage as min.100s 2.7v of vbat. there is no timing limitation at each input signal of rstb, pwmpow and pwmdrv. if each control sign changes into a condition lower than vbat in (1) and (2), it goes via the esd custody diode by the side of vbat of each terminal. a power supply is supplied to vbat and there is a possibility of malfunctioning. moreover, when the entrance current to the terminal exceeds 50ma, it has possibility to damage the lsi. in order to avoid this condition, as shown in the above figure, please insert about 220ohm in a signal line, and apply current qua lification. please confirm an internal pull down resistor in the block diagram and electrical property of p.5. vbat rstb vreg min. 100 s 2.7v dc/dc vout pwmpow pwmdrv 5v 5v figure 29. voltage with a control sign higher than vbat example corresponding to application of conditions figure 28. control signal timing ? ? gnd vbat pin rin 0v 5v 220? datasheet 15/32 bd6581gu tsz02201-0g3g0c400170-1-2 03.dec.2012 rev.001 ? 2012 rohm co., ltd. all rights reserved. tsz22111 k 15 k 001 www.rohm.com ? how to select the number of led lines of the current driver when the number of led lines of the curren t driver is reduced, the un-select can be set the matter that the unnecessary led1 to 6 terminal is connected to gnd. when it uses with 4 lines and so on, it can correspond to it by connecting 2 unnecessary lines to gnd. rstb is used as a power supply of this decision circuit. the se lect of the terminal is judged, it has no relation to the logic of pwmpow and pwmdrv and it isn't judged an unnecessary led line even if it is connected to gnd when it is judged a necessary terminal once. th is information can be reset by setting rstb at 0v. ? start control and select led current driver bd6581gu can control the ic system by rstb, and ic can power off compulsory by setting 0.2v or below. also, it powers on pwmpow is at more than 1.4v and rstb is at more than 2.25v. when rstb=pwmpow=h, iseth current is selected at pw mdrv=h and isetl current is selected at pwmdrv=l. the starting current in pwmdrv=l sets off second time rise of pwmdrv and it becomes 0ma setting after that. after rstb sets l once, the starting current can be flowed again by changing it to h. rstb pwmpow pwmdrv ic led current 1 0 0 off off 1 1 0 on starting current decided with isetl 1 0 1 off off 1 1 1 on current decided with iseth 0 0, 1 0, 1 off off ? attendance point of the restriction resistance input to rstb when the restriction resistance is input to rstb, it is necessary to consider the input current of rstb. the input current of rstb changes that depending on the power-supply volt age and the temperature reference to figure 30. because the temperature characteristic of the input current is shown in figure 30, please choose resistance for which the voltage of the terminal can be guaranteed to 2.1v or more. and, it has the margin in the decision of resistance, and please confirm and make sure it is no problem in a real application. the decision example of restriction resistance 1. when use the current driver of 6 parallel 2.9v(to rstb power-supply) - restriction resistance value 124a(100 ? input current) ? 2.1v restriction resistance value ?(2.9-2.1)/124 a=6.45k ? 2. when use the current driver of 3 parallel 2.9v(to rstb power-supply) - restriction resistance value430 a(100 ? input current) ? 2.1v restriction resistance value ?(2.9-2.1)/430 a=1.86k ? figure 30. figure 31. rstb terminal voltage-rstb inflow current (at the time of the current driver six lines use) in addition, the selection number of parallel number of the curr ent driver is changed, the power-supply current of rstb will be increased. because the maximum value of the consumption current at the rstb=2.1 v is indicated in the following table 1, be careful enough when you calcul ate the restriction resistance. table. the use parallel number of current driver at rstb=2.1v , 100 ? vs. rstb input current parallel numbers used for current driver rstb input current 6 0.12ma 5 0.23ma 4 0.33ma 3 0.43ma 2 0.53ma 1 0.63ma 0 0.74ma limit resistor rstb ? terminal bd6581gu rstb inflow current power supply for rstb 50 100 150 200 250 2.1 2.4 2.7 3 3.3 3.6 rstb[v ] rstb input current[ua] -30 ? +25 ? +80 ? +100 ? datasheet 16/32 bd6581gu tsz02201-0g3g0c400170-1-2 03.dec.2012 rev.001 ? 2012 rohm co., ltd. all rights reserved. tsz22111 k 15 k 001 www.rohm.com ? start to use pwmpow terminal for the pwm control, pwm operating after rstb and pwmdrv is changing l h, input pwm to pwmpow terminal. there is no constraint in turn of rstb and pwmdrv. and, because it corresponds to pwm drive of shorter on time than soft start time (1ms), when pwmpow is input h more than three times, the soft start is invalidated and it enable to correspond the high-speed drive. until rstb is set l, invalidation of the soft start isn't canceled. in case of lighting light off lighting, when it turns off the lights with pwm=l and it starts without soft start when it sets pwm modulated light again. but the peak current of the coil changes owi ng to discharge of output capacitor, it may flow to the over current limit value, as follows figure 32. because soft start can be used when it turns off the lights with rstb=l, the peak current of the coil can be suppressed, as follows figure 33 and th is process of light off is recommended. figure 32. light off control of pwmpow pin at pwm control on pwm=l figure 33. light off control of pwmpow pin at pwm control on rstb=l rstb pwmdr v pwmpo w output voltage current coil rstb pwmdrv pwmpow output voltage current coil datasheet 17/32 bd6581gu tsz02201-0g3g0c400170-1-2 03.dec.2012 rev.001 ? 2012 rohm co., ltd. all rights reserved. tsz22111 k 15 k 001 www.rohm.com l h l h l h l on off on of f rstb pwmpow pwmdrv output volta g e led pin current driver o f starting current rstb pwmpow pwmdrv output voltage current coil rstb pw mpo w pw mdr v output voltage coil curren t ? start to use pwmdrv terminal for the pwm control, pwm operating after rstb and pwmpow is changing l h, input pwm to pwmdrv terminal. there is no constraint in turn of rstb and pwmpow. after rstb and pwmpow is changing l h as follows figure 34, when it is not input pwm to pwmdrv pin but input l, boost of dc/dc is unstable state because current driver doesn?t pass current. the starting current is pulled from each led terminal and pressu re up operating is stabilized to escape from this state. also, the starting current can be set up by the resistance value connected to the isetl terminal. after starting, as the starting current in pwm brightness cont rol become useless, the starting current is set up 0ma at the second rise time of pwmdrv automatically as follows figure 34. in case of lighting light off lighting, when it turns off the lights with pw m=l and it starts without soft start because of soft start period was end when it sets pwm modulated light again. but the peak current of the coil changes owi ng to discharge of output capacitor, it may flow to the over current limit value, as follows figure 35. because soft start can be used when it turns off the lights with rstb=l, the peak current of the coil can be suppressed, as follows figure 36 and th is process of light off is recommended. figure 34. off timing of starting current at pwmdrv=l figure 35. light off control of pwmdrv pin at pwm control on pwm=l figure 36. light off control of pwmdrv pin at pwm control on rstb=l datasheet 18/32 bd6581gu tsz02201-0g3g0c400170-1-2 03.dec.2012 rev.001 ? 2012 rohm co., ltd. all rights reserved. tsz22111 k 15 k 001 www.rohm.com ? brightness control there are two dimming method is available, first method is analog dimming that apply analog voltage to iset terminal, and second method is pwm control via digital dimming of pwmpow or pwmdrv. because each method has the different merit, please choose a suitable method for the application of use. two techniques can be used as digital dimming by the pwm cont rol one is pwm control of curr ent driver, the other is pwm control of power control. as these two characteristics are shown in the below, sele cts to pwm control process comply with application. ~ efficiency emphasis in the low brightness which has an influence with the battery life 2) power control pwm control ~ led current dispersion emphasis in the pwm brightness control 1) current driver pwm control (reference) pwm regulation process efficiency of led current 0.5ma (pwm duty=2.5%) pwm frequency 200hz limit dispersion capability of low duty current driver 70% 0.2% power control 93% 0.5% 1) current driver pwm control is controlled by provid ing pwm signal to pwmdrv, as it is shown figure 41. the current set up with iseth is chosen as the hi section of pwmdrv and the current is off as the lo se ction. therefore, the average led current is increasing in proportion to duty cycl e of pwmdrv signal. this me thod that it lets internal circuit and dc/dc to work, because it becomes to switch the driver, the current tole rance is a few when the pwm brightness is adjusted, it makes it possible to brightness control until 50s (min1% at 200hz). and, don't use for the brightness control, because effect of iseth, isetl changeover is big under 50s on time and under 50s off time. typical pwm frequency is 100hz to 10khz. when rstb sets h l, so the starting current may be effective, after rstb sets l h, it becomes pwm of the starting current and pwm of iseth setting current to pwm two times. pwmdrv led current coil current ic?s active current on off on off on off on figure 37. pwm modulated light by pwm drv pin 2) power control pwm control is controlled by providing pw m signal to pwmpow, as it is shown figure 43. the current setting set up with pwmdrv logic is chosen as the hi secti on and the current is off as t he lo section. therefore, the average led current is increasing in proportion to duty cy cle of pwmpow signal. this method is, because ic can be power-off at off-time, the consumption current can be suppress, and the high efficiency can be available, so it makes it possible to brightness control until 50s (min1% at 200hz). and, don't use for the brightness control, because effect of power on/off time changeover is big under 50s on time and under 50s off time. typical pwm frequency is 100hz to 1khz. also, pwm c an't control rstb and pwmpow at the same time. after rstb sets h, control pwm only pwmpow. pwmpow led current coil current ic?s active current on off on off on off on off figure 38. pwm modulated by pwm pow pin datasheet 19/32 bd6581gu tsz02201-0g3g0c400170-1-2 03.dec.2012 rev.001 ? 2012 rohm co., ltd. all rights reserved. tsz22111 k 15 k 001 www.rohm.com ? led current setting range led current can set up normal and starting setting current. led current can set up normal current by resistance value (r iseth) connecting to iseth voltage and led current can set starting current by resistance value (risetl) connecting to isetl voltage. setting of each led current is given as shown below. normal current = 20ma (24k ? /riseth) starting consta nt current = 0.6/riset l also, normal current setting range is 10ma to 25ma, starting current setting range is off setting or 1a to 100a. led current can set off setting by open setting isetl pin. led current becomes a leak current max 1a at off setting. iseth normal current setting example ? ? ? ? isetl starting current setting example riseth led current risetl led current 24k ? (e24) 20ma 6.2k ? (e24) 97a 25.5 k ? (e96) 18.8ma 10k ? (e6) 60a 27 k ? (e12) 17.8ma 47k ? (e6) 13a 28k ? (e96) 17.1ma 100 k ? (e6) 6a 30k ? (e24) 16.0ma 560 k ? (e12) 1.1a 33k ? (e6) 14.5ma connect to vreg pin 0ma ? the separations of the ic power supply and coil power supply this ic can work in separating the power source in both ic power supply and coil power supply. with this application, it can obtain that decrease of ic power consumption, and the applied voltage exceeds ic rating 22v. that application is shown in below figure 39. the higher vo ltage source is applied to the po wer source of coil that is connected from an adapter etc. next, t he ic power supply is connected with a different coil power supply. under the conditions for inputting from 2.7v to 5.5v into ic vbat, please follow the recommend design in figure 35. it connects vbat terminal and vreg terminal together at ic outside. when the coil power supply is applied, it is no any problem even though ic power supply is the state of 0v. although ic power supply is set to 0v, pull-down resistance is arranged for the power off which cuts off the leak route from coil power supply in ic inside, the leak route is cut off. a nd, there is no power on-off sequence of coil power supply and ic power supply. figure 39. application at the ti me of power supply isolation 10 f batter y vdet sw led1 led2 led3 4.7 h 10led x 6 sensp sensn led4 20ma each 100m ? rtr020n05 2.2 f rstb pwmdrv pwmpow power on/off 200hz pwm vbat led5 led6 fai lsel vreg 1 f 2.7v to 5.5v gnd 24k ? test gnd iseth isetl gnd gnd 7v to 28v coil power supply ic power supply datasheet 20/32 bd6581gu tsz02201-0g3g0c400170-1-2 03.dec.2012 rev.001 ? 2012 rohm co., ltd. all rights reserved. tsz22111 k 15 k 001 www.rohm.com ? the coil selection the dc/dc is designed by more than 4.7h. when l value sets to a lower value, it is possibility t hat the specific sub-harmonic oscillation of current mode dc / dc will be happened. please do not let l value to 3.3h or below. and, l value increases, the phase margin of dc / dc becomes to zero. please enlarge the output capacitor value when you increase l value. example) 4.7h = output capacitor 2.2f/50v 1pcs 6.8h = output capacitor 2.2f/50v 2pcs 10h = output capacitor 2.2f/50v 3pcs this value is just examples, please made sure the final judgment is under an enough evaluation. ? layout in order to make the most of the perform ance of this ic, its layout pattern is very important. characteristics such as efficiency and ripple and the likes change greatly with layout patterns, which please note carefully. rstb test iseth vbat gnd pwmpow vreg isetl pwmdrv gnd failsel gnd led1 led5 led4 led3 led2 led6 vdet sw sensp sensn 12345 a b c d e rese t pwm to gnd to cathode of led c ba t c in c out c reg l r sense riset to anode of each led sbd t r figure 40. layout connect the input bypath capacitor cin(10f) near est to coil l, as shown in the upper diagram. wire the power supply line by the low resistance from cin to vbat pin. thereby, the input vo ltage ripple of the ic can be reduced. connect smoothing capacitor creg of the regulator nearest to between vreg and gnd pin, as shown in the upper diagram. connect schottky barrier diode sbd of the r egulator nearest to between coil l and switching transistor tr. and connect output capacitor cout nearest to between cin and gnd pin. thereby, the output vo ltage ripple of the ic can be reduced. connect switching transistor tr nearest to sw pin. wire co il l and switching transistor tr, current sensing resistor r sense by the low resistance. wiring to the sensp pin isn't tr side, but connect it from r sense side. over current value may become low when wiring from tr side. connect r sense of gnd side isolated to sens pin. don?t wire between r sense and snesn pin wiring from r sense pin to gnd pin. and r sense gnd line must be wired directly to gnd pin of output capacitor. it has the possibility that restricts the current drive performance by the influence of the noise when other gnd is connected to t his gnd.connect led current setting resistor riset nearest to iset pin. there is possibility to oscillate when capacity is added to iset terminal, so pay attention that capacity isn't added. and, riset of gnd side must be wired directly to gnd pin. when those pins are not connected di rectly near the chip, influence is given to the performance of bd6581gu, and may limit the current drive performance. as for the wire to the inductor, make its resistance component small so as to reduce electric power consumption and increase the entire efficiency. datasheet 21/32 bd6581gu tsz02201-0g3g0c400170-1-2 03.dec.2012 rev.001 ? 2012 rohm co., ltd. all rights reserved. tsz22111 k 15 k 001 www.rohm.com ? selection of external parts recommended external parts are as shown below. when to use other parts than these, se lect the following equivalent parts. ~ coil value manufacturer product number size dc current (ma) dcr (? ) vertical horizontal height (max) 4.7 h toko a915ay-4r7m 5.2 5.2 3.0 1870 0.045 4.7 h toko b1015as-4r7m 8.4 8.3 4.0 3300 0.038 4.7 h toko a1101as-4r7m 4.1 4.1 1.2 1400 0.115 4.7 h tdk ltf5022t-4r7n2r0 5.0 5.2 2.2 2000 0.073 4.7 h tdk vlp6810t-4r7m1r6 6.3 6.8 1.0 1600 0.167 10 h tdk vlp6810t-100m1r1 6. 3 6.8 1.0 1100 0.350 ~ capacitor value pressure manufacturer product number size tc cap to l vertical horizontal height [ supply voltage capacitor ] 10 f 25v murata grm31cb31e106k 3.2 1.6 1.6 ? 0.2 b +/-10% 10 f 10v murata grm219r61a106k 2.0 1.25 0.85 ? 0.15 x5r +/-10% 4.7 f 25v murata grm319r61e475k 3.2 1.6 0.85 ? 0.1 x5r +/-10% 4.7 f 25v murata grm21br61e475k 2.0 1.25 1.25 ? 0.1 x5r +/-10% [ smoothing capacitor for built-in regulator ] 1 f 10v murata grm188b10j105k 1.6 0.8 0.8 ? 0.1 b +/-10% [ output capacitor ] 1 f 50v murata grm31mb31h105k 3.2 1.6 1.15 ? 0.1 b +/-10% 1 f 50v murata grm21bb31h105k 2.0 1.25 1.25 ? 0.1 b +/-10% 2.2 f 50v murata grm31cb31h225k 3.2 1.6 1.6 ? 0.2 b +/-10% 0.33 f 50v murata grm219b31h334k 2.0 1.25 0.85 ? 0.1 b +/-10% ~ resistor value tolerance manufacturer product number size vertical horizontal height [ resistor for led current decision datasheet 22/32 bd6581gu tsz02201-0g3g0c400170-1-2 03.dec.2012 rev.001 ? 2012 rohm co., ltd. all rights reserved. tsz22111 k 15 k 001 www.rohm.com ? attention point of board layout in board pattern design, the wiring of power supply line shou ld be low impedance, and put the bypass capacitor if necessary. especially the wiring impedance must be lower around the dc/dc converter. ? about heat loss in heat design, operate the dc/dc conver ter in the following condition. (the following temperature is a guarantee te mperature, so consider the margin.) 1. periphery temperature ta must be less than 85 o c. 2. the loss of ic must be less than dissipation pd. datasheet 23/32 bd6581gu tsz02201-0g3g0c400170-1-2 03.dec.2012 rev.001 ? 2012 rohm co., ltd. all rights reserved. tsz22111 k 15 k 001 www.rohm.com ? application example figure 41. 10 series x 6parallel hi current 20ma setting figure 42. 10 series x 4parallel hi current 20ma setting current driver pwm application current driver pwm application * please select the capacitor wh ich the little bias fluctuation. power control pwm application * please select the capacitor wh ich the little bias fluctuation. terminal processing test pin = connect to gnd n.c. = nothing specified in pa rticular. open is recommended. vreg = when ic is driving from the outside of 2.7 to 5.5v, short vbat and vreg, and put the voltage to vreg failsel, pwmdrv = connect to gnd in case of fixing at l level. connect to vreg of ic or the power supply of more than 1.4v in case of fixing at h level. led1-6 = when each led driver are not used, connect to gnd of ic gnd = each gnd is connecting inside ic, but, connect to gnd of all board rstb = rstb is used as a power supply of internal circuit. so, you mustn?t input rstb voltage with pull up resistor of several k ? . and, please care about the relation between vbat and rstb enough. 10 f batter y vdet sw led1 led2 led3 4.7 h 10led x 6parallel sensp sensn led4 each 20ma 100m ? rtr020n05 2.2 f * rstb pwmpow pwmdrv power on/off 200hz pwm vbat led5 led6 failsel gnd 24k ? test gnd iseth vreg 1 f isetl gnd gnd 10 f batter y vdet sw led1 led2 led3 4.7 h 10led x 4aprallel sensp sensn led4 each 20ma 150m ? rtr020n05 2.2 f * rstb pwmpow pwmdrv power on/off 200hz pwm vbat led5 led6 fai lsel gnd 24k ? test gnd iseth vreg 1 f isetl gnd gnd 10 f batter y vdet sw led1 led2 led3 4.7 h 10led x 6parallel sensp sensn led4 each 20ma 100m ? rtr020n05 2.2 f * rstb pwmpow pwmdrv power on/off 200hz pwm vbat led5 led6 fai lsel gnd 24k ? test gnd iseth vreg 1 f isetl gnd gnd 10 f batter y vdet sw led1 led2 led3 4.7 h 10led x 6parallel sensp sensn led4 each 20ma 100m ? rtr020n05 2.2 f * rstb pwmpow pwmdrv power on/off 200hz pwm vbat led5 led6 failsel vreg 1 f 2.7v to 5.5v gnd 24k ? test gnd iseth isetl gnd gnd figure 43. 10 series x 6parallel led current 20ma setting figure 44. non-used inside reg or operating under 5v application datasheet 24/32 bd6581gu tsz02201-0g3g0c400170-1-2 03.dec.2012 rev.001 ? 2012 rohm co., ltd. all rights reserved. tsz22111 k 15 k 001 www.rohm.com ? led current setting controlled iseth resistor. 19.6k ? : 24.5ma 24k ? : 20ma 30k ? : 16ma 33k ? : 14.5ma ? brightness control please input pwm pulse from pwmpow or pwmdrv terminal. please refer electrical characteristic page.6 and function (page.17). 15inch panel 10 f batter y vdet sw led1 led2 led3 4.7 h 10led x 6 parallel sensp sensn led4 each 20ma 47m ? rtr020n05 2.2 f * rstb pwmpow pwmdrv power on/off 100hz~10khz pwm vbat led5 led6 failsel gnd 24k ? test gnd iseth vreg 1 f isetl gnd gnd can be set up to each 10 ~25ma figure 45. 10 series 6 parallel, led current 20ma setting current driver pwm application 13 to 14inch panel 10 f batter y vdet sw led1 led2 led3 4.7 h 8led x 6 parallel sensp sensn led4 each 20ma 51m ? rtr020n05 2.2 f * rstb pwmpow pwmdrv power on/off 100hz~1khz pwm vbat led5 led6 failsel gnd 24k ? test gnd iseth vreg 1 f isetl gnd gnd can be set up to each 10~25ma 10 f batter y vdet sw led1 led2 led3 4.7 h 8led x 6 parallel sensp sensn led4 each 20ma 51m ? rtr020n05 2.2 f * rstb pwmpow pwmdrv power on/off 100hz~10khz pwm vbat led5 led6 failsel gnd 24k ? test gnd iseth vreg 1 f isetl gnd gnd can be set up to each 10~25ma figure 46. 8 series 6 parallel, led current 20ma setting figure 47. 8 series 6 parallel, led current 20ma setting power control pwm application current driver pwm application * please select the capacitor wh ich the little bias fluctuation. datasheet 25/32 bd6581gu tsz02201-0g3g0c400170-1-2 03.dec.2012 rev.001 ? 2012 rohm co., ltd. all rights reserved. tsz22111 k 15 k 001 www.rohm.com ? led current setting controlled iseth resistor. 19.6k ? : 24.5ma 24k ? : 20ma 30k ? : 16ma 33k ? : 14.5ma ? brightness control ? brightness control please input pwm pulse from pwmpow or pwmdrv terminal. please refer electrical characteristic page.6 and function (page.17). 10 to 12inch panel 10 f batter y vdet sw led1 led2 led3 4.7 h 7led x 6 parallel sensp sensn led4 each 16ma 56m ? rtr020n05 2.2 f * rstb pwmpow pwmdrv power on/off 100hz~10khz pwm vbat led5 led6 failsel gnd 30k ? test gnd iseth vreg 1 f isetl gnd gnd can be set up to each 10~25ma 10 f batter y vdet sw led1 led2 led3 4.7 h 10led x4 parallel sensp sensn led4 each 20ma 56m ? rtr020n05 2.2 f * rstb pwmpow pwmdrv power on/off 100hz~10khz pwm vbat led5 led6 failsel gnd 24k ? test gnd iseth vreg 1 f isetl gnd gnd can be set up to each 10~25ma figure 48. 7 series 6 parallel, led current 16ma setting figure 49. 10 series 4 parallel, led current 20ma setting current driver pwm application current driver pwm application 7inch panel 10 f batter y vdet sw led1 led2 led3 4.7 h 8led x 3 parallel sensp sensn led4 each 20m a 68m ? rtr020n05 2.2 f * rstb pwmpow pwmdrv power on/off 100hz~10khz pwm vbat led5 led6 failsel gnd 24k ? test gnd iseth vreg 1 f isetl gnd gnd can be set up to each 10~25ma 10 f batter y vdet sw led1 led2 led3 4.7 h 6led x 4 parallel sensp sensn led4 each 20ma 68m ? rtr020n05 2.2 f * rstb pwmpow pwmdrv power on/off 100hz~10khz pwm vbat led5 led6 failsel gnd 24k ? test gnd iseth vreg 1 f isetl gnd gnd can be set up to each 10~25ma figure 50. 8 series 3 parallel, led current 20ma setting figure 51. 6 series 4 parallel, led current 20ma setting current driver pwm application current driver pwm application * please select the capacitor wh ich the little bias fluctuation. datasheet 26/32 bd6581gu tsz02201-0g3g0c400170-1-2 03.dec.2012 rev.001 ? 2012 rohm co., ltd. all rights reserved. tsz22111 k 15 k 001 www.rohm.com ? led current setting controlled iseth resistor. 19.6k ? : 24.5ma 24k ? : 20ma 30k ? : 16ma 33k ? : 14.5ma ? brightness control ? brightness control please input pwm pulse from pwmpow or pwmdrv terminal. please refer electrical characteristic page.6 and function (page.17). 7inch panel 10 f batter y vdet sw led1 led2 led3 4.7 h 4led x 6 parallel sensp sensn led4 each 20m a 68m ? rtr020n05 2.2 f * rstb pwmpow pwmdrv power on/off 100hz~1khz pwm vbat led5 led6 failsel gnd 24k ? test gnd iseth vreg 1 f isetl gnd gnd can be set up to each 10~25ma 10 f batter y vdet sw led1 led2 led3 4.7 h 8led x 3 parallel sensp sensn led4 each 40ma 68m ? rtr020n05 2.2 f * rstb pwmpow pwmdrv power on/off 100hz~1khz pwm vbat led5 led6 failsel gnd 24k ? test gnd iseth vreg 1 f isetl gnd gnd can be set up to each 20~50ma figure 52. 4 series 6 parallel, led current 20ma setting figure 53. 8 series 3 parallel, led current 40ma setting power control pwm application power control pwm application 5inch panel 10 f batter y vdet sw led1 led2 led3 4.7 h 8led x 2 parallel sensp sensn led4 each 20ma 82m ? rtr020n05 2.2 f * rstb pwmpow pwmdrv power on/off 100hz~10khz pwm vbat led5 led6 failsel gnd 24k ? test gnd iseth vreg 1 f isetl gnd gnd can be set up to each 10~25ma 10 f batter y vdet sw led1 led2 led3 4.7 h 8led x 2 parallel sensp sensn led4 each 40ma 82m ? rtr020n05 2.2 f * rstb pwmpow pwmdrv power on/off 100hz~1khz pwm vbat led5 led6 failsel gnd 24k ? test gnd iseth vreg 1 f isetl gnd gnd can be set up to each 20~50ma figure 54. 8 series 2 parallel, led current 20ma setting figure 55. 8 series 2 parallel, led current 40ma setting current driver pwm application power control pwm application * please select the capacitor wh ich the little bias fluctuation. datasheet 27/32 bd6581gu tsz02201-0g3g0c400170-1-2 03.dec.2012 rev.001 ? 2012 rohm co., ltd. all rights reserved. tsz22111 k 15 k 001 www.rohm.com ? led current setting controlled iseth resistor. 19.6k ? : 24.5ma 24k ? : 20ma 30k ? : 16ma 33k ? : 14.5ma ? brightness control ? brightness control please input pwm pulse from pwmpow or pwmdrv terminal. please refer electrical characteristic page.6 and function (page.17). 5inch panel 10 f batter y vdet sw led1 led2 led3 4.7 h 4led x 4 parallel sensp sensn led4 each 20ma 82m ? rtr020n05 2.2 f * rstb pwmpow pwmdrv power on/off 100hz~10khz pwm vbat led5 led6 failsel gnd 24k ? test gnd iseth vreg 1 f isetl gnd gnd can be set up to each 10~25ma 10 f batter y vdet sw led1 led2 led3 4.7 h 8led x 2 parallel sensp sensn led4 each 60ma 82m ? rtr020n05 2.2 f * rstb pwmpow pwmdrv power on/off 100hz~10khz pwm vbat led5 led6 failsel gnd 24k ? test gnd iseth vreg 1 f isetl gnd gnd can be set up to each 30~75ma figure 56. 4 series 4 parallel, led current 20ma setting figure 57. 8 series 2 parallel, led current 60ma setting current driver pwm application current driver pwm application 10 f batter y vdet sw led1 led2 led3 4.7 h 3led x 5 parallel sensp sensn led4 each 20ma 82m ? rtr020n05 2.2 f * rstb pwmpow pwmdrv power on/off 100hz~1khz pwm vbat led5 led6 failsel gnd 24k ? test gnd iseth vreg 1 f isetl gnd gnd can be set up to each 10~25ma figure 58. 3 series 5 parallel, led current 20ma setting power control pwm application * please select the capacitor wh ich the little bias fluctuation. datasheet 28/32 bd6581gu tsz02201-0g3g0c400170-1-2 03.dec.2012 rev.001 ? 2012 rohm co., ltd. all rights reserved. tsz22111 k 15 k 001 www.rohm.com ? led current setting controlled iseth resistor. 19.6k ? : 24.5ma 24k ? : 20ma 30k ? : 16ma 33k ? : 14.5ma * please select the capacitor wh ich the little bias fluctuation. ? brightness control please input pwm pulse from pwmpow or pwmdrv terminal. please refer electrical characteristic page.6 and function (page.17). for the application of 22v and more for big current led 10 f batter y vdet sw led1 led2 led3 4.7 h 8led x 6 parallel sensp sensn led4 each 20ma 51m ? rtr020n05 2.2 f * rstb pwmpow pwmdrv power on/off 200h z pw m vbat led5 led6 failsel gnd 24k ? test gnd iseth vreg 1 f isetl gnd gnd 2.7~22v 1 f coil power supply 6~30v ic power supply can be set up to each 10~25ma 10 f batter y vdet sw led1 led2 led3 4.7 h 8led x 1 parallel sensp sensn led4 120ma 82m ? rtr020n05 2.2 f * rstb pwmpow pwmdrv power on/off 100hz~10khz pwm vbat led5 led6 failsel gnd 24k ? test gnd iseth vreg 1 f isetl gnd gnd can be set up to 60~150ma figure 59. figure 60. the separation of less than an ic power supply 5v and the coil power supply 10 f batter y vdet sw led1 led2 led3 4.7 h 10led x 6 parallel sensp sensn led4 each 20ma 51m ? rtr020n05 2.2 f * rstb pwmpow pwmdrv power on/off 200h z pw m vbat led5 led6 failsel gnd 24k ? test gnd iseth vreg 1 f isetl gnd gnd 2.7~5.5v 1 f can be set up to each 10~25ma coil power supply 6~30v ic power supply figure 61. * please select the capacitor wh ich the little bias fluctuation. datasheet 29/32 bd6581gu tsz02201-0g3g0c400170-1-2 03.dec.2012 rev.001 ? 2012 rohm co., ltd. all rights reserved. tsz22111 k 15 k 001 www.rohm.com control led current to charged d/a voltage. show application example and typ control. please decide final value after you ev aluated application, characteristic. 10 f batter y vdet sw led1 led2 led3 4.7 h 8led x 6 parallel sensp sensn led4 each 20ma 51m ? rtr020n05 2.2 f * rstb pwmpow pwmdrv power on/off vbat led5 led6 failsel gnd 470k ? test gnd iseth vreg 1 f isetl gnd gnd 24k ? d/a d/a led current 0.05v 19.4ma 0.2v 14.4ma 0.4v 7.7ma 0.5v 4.4ma 0.6v 1.0ma 0.7v 0ma led current = iset voltage 470k ? + iset voltage -d/ a 24k ? 800 typ led current = 0.6v 470k ? + 0.6v-d/a 24k ? 800 figure 62. analog style optical application * please select the capacitor wh ich the little bias fluctuation. datasheet 30/32 bd6581gu tsz02201-0g3g0c400170-1-2 03.dec.2012 rev.001 ? 2012 rohm co., ltd. all rights reserved. tsz22111 k 15 k 001 www.rohm.com ? operational notes (1) absolute maximum ratings an excess in the absolute maximum ratings, such as supply vo ltage, temperature range of operating conditions, etc., can break down devices, thus making impossible to identify break ing mode such as a short circuit or an open circuit. if any special mode exceeding the absolute maximum ratings is assumed, consideration should be given to take physical safety measures including the use of fuses, etc. (2) operating conditions these conditions represent a range within which characteri stics can be provided approx imately as expected. the electrical characteristics are guaranteed under the conditions of each parameter. (3) reverse connection of power supply connector the reverse connection of power supply connector can break down ics. take protective measures against the breakdown due to the reverse connection, such as mount ing an external diode between the power supply and the ic?s power supply terminal. (4) power supply line design pcb pattern to provide low impedance for the wiring between the power supply and the gnd lines. in this regard, for the digital block power supply and the analog block power supply, even though these power supplies has the same level of potential, separate the power supply pattern for the digital block from that for t he analog block, thus suppressing the diffraction of digital noises to the analog block power supply resulting from impedance common to the wiring patterns. for the gnd line, give consideration to design the patterns in a similar manner. furthermore, for all power supply terminals to ics, mount a capacitor between the power supply and the gnd terminal. at the same time, in order to use an electrolytic capacitor, t horoughly check to be sure the char acteristics of the capacitor t o be used present no problem including the occurrence of capacity dropout at a low temperature, thus determining the constant. (5) gnd voltage make setting of the potential of the gnd terminal so that it will be maintained at the minimum in any operating state. furthermore, check to be sure no terminals are at a potential lower than the gnd voltage including an actual electric transient . (6) short circuit between terminals and erroneous mounting in order to mount ics on a set pcb, pay thorough attention to the direction and offset of the ics. erroneous mounting can break down the ics. furthermore, if a short circuit occurs due to foreign matters entering between terminals or between the terminal and the power supply or t he gnd terminal, the ics can break down. (7) operation in strong electromagnetic field be noted that using ics in the strong elec tromagnetic field can malfunction them. (8) inspection with set pcb on the inspection with the set pcb, if a capacitor is connec ted to a low-impedance ic terminal, the ic can suffer stress. therefore, be sure to discharge from the set pcb by each proc ess. furthermore, in order to mount or dismount the set pcb to/from the jig for the inspection process, be sure to turn off the power supply and then mount the set pcb to the jig. after the completion of the inspection, be sure to turn off the power supply and then di smount it from the jig. in addition, for protection against static electricity, establis h a ground for the assembly process and pay thorough attention to the transportation and t he storage of the set pcb. (9) input terminals in terms of the construction of ic, para sitic elements are inevitably formed in relation to potential. the operation of the parasitic element can cause interference with circuit operation, thus resulting in a malfunct ion and then breakdown of the input terminal. therefore, pay thorough attention not to handle the input terminals, such as to apply to the input terminals a voltage lower than the gnd respectively , so that any parasitic element will operate. furthermore, do not apply a voltage to the input terminals when no power supply voltage is applied to the ic. in addition, even if the power supply voltage is applied, apply to the input terminals a voltage lower than the power supply voltag e or within the guaranteed value of electrical characteristics. (10) ground wiring pattern if small-signal gnd and large-current gnd are provided, it will be recommended to separate the large-current gnd pattern from the small-signal gnd pattern and establish a si ngle ground at the reference poi nt of the set pcb so that resistance to the wiring pattern and voltage fluctuations due to a large current will cause no fluc tuations in voltages of the small-signal gnd. pay attention not to cause fluctuations in the gnd wiring pattern of external parts as well. (11) external capacitor in order to use a ceramic capacitor as the external capaci tor, determine the constant with consideration given to a degradation in the nominal capacitance due to dc bias and c han ges in the capacitance due to temperature, etc. (12) thermal shutdown circuit (tsd) when junction temperatures become 175c (typ) or higher, the t hermal shutdown circuit operates and turns a switch off. the thermal shutdown circuit, which is aimed at isolating the lsi from thermal runaway as much as possible, is not aimed at the protection or guarantee of the lsi. therefore, do not c ontinuously use the lsi with this circuit operating or use the lsi assuming its operation. (13) thermal design perform thermal design in which there are adequate margins by taking into account the permissible dissipation (pd) in actual states of use. (14) selection of coil select the low dcr inductors to decrease power loss for dc/dc converter. datasheet 31/32 bd6581gu tsz02201-0g3g0c400170-1-2 03.dec.2012 rev.001 ? 2012 rohm co., ltd. all rights reserved. tsz22111 k 15 k 001 www.rohm.com ? ordering information ? marking diagram ? physical dimension tape and reel information figure 64 vcsp85h2 (bd6581gu) b d 6 5 8 1 g u - e 2 part number package gu: vcsp85h2 packaging and forming specification e2: embossed tape and reel figure 63 marking diagram (top view) vcsp85h2 bd6581 part number marking lot number 1pin mark ? order quantity needs to be multiple of the minimum quantity. datasheet 32/32 bd6581gu tsz02201-0g3g0c400170-1-2 03.dec.2012 rev.001 ? 2012 rohm co., ltd. all rights reserved. tsz22111 k 15 k 001 www.rohm.com ? revision history date revision changes 03.dec.2012 001 new release datasheet d a t a s h e e t notice - ge rev.002 ? 2014 rohm co., ltd. all rights reserved. notice precaution on using rohm products 1. our products are designed and manufac tured for application in ordinary elec tronic equipments (such as av equipment, oa equipment, telecommunication equipment, home electroni c appliances, amusement equipment, etc.). if you intend to use our products in devices requiring ex tremely high reliability (such as medical equipment (note 1) , transport equipment, traffic equipment, aircraft/spacecra ft, nuclear power controllers, fuel c ontrollers, car equipment including car accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or serious damage to property (?specific applications?), please consult with the rohm sale s representative in advance. unless otherwise agreed in writing by rohm in advance, ro hm shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of any ro hm?s products for specific applications. (note1) medical equipment classification of the specific applications japan usa eu china class class class b class class class 2. rohm designs and manufactures its products subject to strict quality control system. however, semiconductor products can fail or malfunction at a certain rate. please be sure to implement, at your own responsibilities, adequate safety measures including but not limited to fail-safe desi gn against the physical injury, damage to any property, which a failure or malfunction of our products may cause. the following are examples of safety measures: [a] installation of protection circuits or other protective devices to improve system safety [b] installation of redundant circuits to reduce the impact of single or multiple circuit failure 3. our products are designed and manufactured for use under standard conditions and not under any special or extraordinary environments or conditio ns, as exemplified below. accordin gly, rohm shall not be in any way responsible or liable for any damages, expenses or losses arising from the use of an y rohm?s products under any special or extraordinary environments or conditions. if you intend to use our products under any special or extraordinary environments or conditions (as exemplified bel ow), your independent verification and confirmation of product performance, reliability, etc, prior to use, must be necessary: [a] use of our products in any types of liquid, incl uding water, oils, chemicals, and organic solvents [b] use of our products outdoors or in places where the products are exposed to direct sunlight or dust [c] use of our products in places where the products ar e exposed to sea wind or corrosive gases, including cl 2 , h 2 s, nh 3 , so 2 , and no 2 [d] use of our products in places where the products are exposed to static electricity or electromagnetic waves [e] use of our products in proximity to heat-producing components, plastic cords, or other flammable items [f] sealing or coating our products with resin or other coating materials [g] use of our products without cleaning residue of flux (ev en if you use no-clean type fluxes, cleaning residue of flux is recommended); or washing our products by using water or water-soluble cleaning agents for cleaning residue after soldering [h] use of the products in places subject to dew condensation 4. the products are not subjec t to radiation-proof design. 5. please verify and confirm characteristics of the final or mounted products in using the products. 6. in particular, if a transient load (a large amount of load applied in a short per iod of time, such as pulse. is applied, confirmation of performance characteristics after on-boar d mounting is strongly recomm ended. avoid applying power exceeding normal rated power; exceeding the power rating under steady-state loading c ondition may negatively affect product performance and reliability. 7. de-rate power dissipation (pd) depending on ambient temper ature (ta). when used in seal ed area, confirm the actual ambient temperature. 8. confirm that operation temperat ure is within the specified range descr ibed in the product specification. 9. rohm shall not be in any way responsible or liable for fa ilure induced under deviant condi tion from what is defined in this document. precaution for mounting / circuit board design 1. when a highly active halogenous (chlori ne, bromine, etc.) flux is used, the resi due of flux may negatively affect product performance and reliability. 2. in principle, the reflow soldering method must be used; if flow soldering met hod is preferred, please consult with the rohm representative in advance. for details, please refer to rohm mounting specification datasheet d a t a s h e e t notice - ge rev.002 ? 2014 rohm co., ltd. all rights reserved. precautions regarding application examples and external circuits 1. if change is made to the constant of an external circuit, pl ease allow a sufficient margin c onsidering variations of the characteristics of the products and external components, including transient characteri stics, as well as static characteristics. 2. you agree that application notes, re ference designs, and associated data and in formation contained in this document are presented only as guidance for products use. theref ore, in case you use such information, you are solely responsible for it and you must exercise your own independent verification and judgment in the use of such information contained in this document. rohm shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of such information. precaution for electrostatic this product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. please take proper caution in your manufacturing process and storage so that voltage exceeding t he products maximum rating will not be applied to products. please take special care under dry condit ion (e.g. grounding of human body / equipment / solder iron, isolation from charged objects, se tting of ionizer, friction prevention and temperature / humidity control). precaution for storage / transportation 1. product performance and soldered connections may deteriora te if the products are stor ed in the places where: [a] the products are exposed to sea winds or corros ive gases, including cl2, h2s, nh3, so2, and no2 [b] the temperature or humidity exceeds those recommended by rohm [c] the products are exposed to di rect sunshine or condensation [d] the products are exposed to high electrostatic 2. even under rohm recommended storage c ondition, solderability of products out of recommended storage time period may be degraded. it is strongly recommended to confirm sol derability before using products of which storage time is exceeding the recommended storage time period. 3. store / transport cartons in the co rrect direction, which is indicated on a carton with a symbol. otherwise bent leads may occur due to excessive stress applied when dropping of a carton. 4. use products within the specified time after opening a hum idity barrier bag. baking is required before using products of which storage time is exceeding the recommended storage time period. precaution for product label qr code printed on rohm products label is for rohm?s internal use only. precaution for disposition when disposing products please dispose them proper ly using an authorized industry waste company. precaution for foreign exchange and foreign trade act since our products might fall under cont rolled goods prescribed by the applicable foreign exchange and foreign trade act, please consult with rohm representative in case of export. precaution regarding intellectual property rights 1. all information and data including but not limited to application example contain ed in this document is for reference only. rohm does not warrant that foregoi ng information or data will not infringe any intellectual property rights or any other rights of any third party regarding such information or data. rohm shall not be in any way responsible or liable for infringement of any intellectual property rights or ot her damages arising from use of such information or data.: 2. no license, expressly or implied, is granted hereby under any intellectual property rights or other rights of rohm or any third parties with respect to the information contained in this document. other precaution 1. this document may not be reprinted or reproduced, in whol e or in part, without prior written consent of rohm. 2. the products may not be disassembled, converted, modified, reproduced or otherwise changed without prior written consent of rohm. 3. in no event shall you use in any wa y whatsoever the products and the related technical information contained in the products or this document for any military purposes, incl uding but not limited to, the development of mass-destruction weapons. 4. the proper names of companies or products described in this document are trademarks or registered trademarks of rohm, its affiliated companies or third parties. datasheet datasheet notice ? we rev.001 ? 2014 rohm co., ltd. all rights reserved. general precaution 1. before you use our pro ducts, you are requested to care fully read this document and fully understand its contents. rohm shall n ot be in an y way responsible or liabl e for fa ilure, malfunction or acci dent arising from the use of a ny rohms products against warning, caution or note contained in this document. 2. all information contained in this docume nt is current as of the issuing date and subj ec t to change without any prior notice. before purchasing or using rohms products, please confirm the la test information with a rohm sale s representative. 3. the information contained in this doc ument is provi ded on an as is basis and rohm does not warrant that all information contained in this document is accurate an d/or error-free. rohm shall not be in an y way responsible or liable for an y damages, expenses or losses incurred b y you or third parties resulting from inaccur acy or errors of or concerning such information. |
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