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1/28 www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. led drivers for lcd backlights white backlight led driver for medium to large lcd panels (switching regulator type) BD6150MUV description BD6150MUV is white led driver ic with pwm step-up dc/dc c onverter that can boost max 40v and current driver that can drive max 30ma. the wide and precision brightness can be c ontrolled by external pwm pulse. BD6150MUV 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 1) high efficiency pwm step-up dc/dc converter (fsw=1.25mhz / 0.75mhz) 2) high accuracy & good matching current drivers (max30ma/ch) 3) integrated 50v power nch mosfet 4) soft start 5) drive up to 10 in series 6strings in parallel 6) wide input voltage range (4.2v ~ 26v) 7) rich safety functions ? over-voltage protection ? over current limit ? led terminal open/short protect ? external sbd open detect / output short protection ? uvlo ? thermal shutdown 8) small & thin package (vqfn024v4040) 4.0 4.0 1.0mm applications all middle size lcd equipments backlight of notebook pc, portable dvd player, car navigation systems, etc. absolute maximum ratings (ta=25 ) parameter symbol ratings unit condition maximum applied voltage 1 vmax1 7 v vreg, iset, pwmdrv, fsel, ocpset, vdet, test maximum applied voltage 2 vmax2 25 v led1, led2, led3, led4, led5, led6 maximum applied voltage 3 vmax3 30.5 v vbat, failflag, pwmpow maximum applied voltage 4 vmax4 41 v sw power dissipation 1 pd1 500 *1 mw power dissipation 2 pd2 780 *2 mw power dissipation 3 pd3 1510 *3 mw operating temperature range topr -40 ~ +85 storage temperature range tstg -55 ~ +150 *1 reduced 4.0mw/ with ta>25 when not mounted on a heat radiation board. *2 1 layer (rohm standard board) has been mounted. copper foil area 0mm 2 , when it?s used by more than ta=25 , it?s reduced by 6.2mw/ . *3 4 layer (jedec compliant board) has been mounted. copper foil area 1layer 6.28mm 2 , copper foil area 2~4layers 5655.04mm 2 , when it?s used by more than ta=25 , it?s reduced by 12.1mw/ . no.11040ebt06
technical note 2/28 www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6150MUV recommended operating range (ta=-40 ~ +85 ) parameter symbol limits unit condition min. typ. max. power supply voltage vbat 4.2 12.0 26.0 v electrical characteristic (unless otherwise specified, vbat=12v, ta = +25 ) parameter symbol limits unit condition min. typ. max. quiescent current iq - 1.6 4.4 a pwmpow=0v current consumption idd - 3.2 4.8 ma vdet=0v,iset=22k ? [pwmpow terminal] low input voltage range1 powl 0 - 0.9 v high input voltage range1 powh 2.1 - vbat v pull down resistor1 powr 100 300 500 k ? pwmpow=3v [pwmdrv terminal] low input voltage range2 pdrvl 0 - 0.9 v high input voltage range2 pdrvh 2.1 - 5.5 v pull down resistor2 drvr 100 300 500 k ? [fsel terminal] low input voltage range3 fsl 0 - 0.9 v high input voltage range3 fsh 2.1 - 6.0 v pull down resistor3 fsr 100 300 500 k ? fsel=1v [failflag] input resistor ffir 1.0 2.0 3.0 k ? failflag=2.5v off current ffist - 0.1 2.0 a pwmpow=0v [regulator] vreg voltage vreg 4.2 5.0 6.0 v no load under voltage lock out uvlo 3.3 3.7 4.1 v vbat falling edge [switching regulator] led control voltage vled 0.56 0.70 0.84 v switching frequency fsw 1.00 1.25 1.50 mhz fsel=l (gnd short) duty cycle limit duty 91 95.0 99.0 % led1-6=0.3v sw nch fet ron ron - 0.48 0.58 ? isw=80ma [protection] over current limit ocp 1.4 2.0 2.6 a *1 ocpset=68k ? ocpset open protect oop - 0.0 0.1 a ocpset=2m ? over voltage limit input ovl 0.96 1.00 1.04 v detect voltage of vdet pin sbd open protect sop 0.02 0.05 0.08 v detect voltage of vdet pin vdet leak current ovil - 0.1 1.0 a [current driver] led maximum current ilmax - - 30 ma led current accuracy ilaccu - - 3.0 % iled=16~20ma led current matching ilmat - - 1.5 % each led current/average (led1-6) iled=16~20ma led current limiter ilocp - 0 0.1 ma current limit value at iset resistor 1k? setting led terminal over voltage protect ledovp 10.0 11.5 13.0 v pwmdrv=2.5v iset voltage iset 0.5 0.6 0.7 v *1 this parameter is tested with dc measurement.
technical note 3/28 www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6150MUV reference data 0 5 10 15 20 25 30 0 5 10 15 20 25 30 vbat [v] icc [ua] -40 85 25 0 0.5 1 1.5 2 2.5 3 3.5 4 0 5 10 15 20 25 30 vbat [v] icc [ma] 85 25 -40 4.8 4.9 5 5.1 5.2 5.3 -40 - 20 0 20 40 60 80 100 temp [ ] vreg [v] 6v 12v 22v 3.4 3.5 3.6 3.7 3.8 3.9 -40 -20 0 20 40 60 80 100 temp (c) uvlo (v) rising falling 590 600 610 620 -40-200 20406080100 temp [c] iset [mv] 4.2v 5v 6v 1000 1100 1200 1300 1400 1500 -40 -20 0 20 40 60 80 100 temp [ ] freq [khz] 6v 4.2v 5v 92 93 94 95 96 97 98 -40 -20 0 20 40 60 80 100 temp [ ] max duty [%] 4.2v 5v 6v 0 100 200 300 400 500 600 700 800 900 2.4 3 3.6 4.2 4.8 5.4 6 6.6 7.2 vreg [v] ron [m ] -40 25 85 1.4 1.6 1.8 2 2.2 2.4 2.6 -40 - 20 0 20 40 60 80 100 temp [c] sw_icoil [a] 4.2v 5v 6v 0.8 0.9 1 1.1 1.2 - 40 - 20 0 20 40 60 80 100 temp [c] vdet [v] 4.2v 5v, 6v 30 40 50 60 70 -40 -20 0 20 40 60 80 100 temp [ ] vdet[mv] 4.2v, 5v, 6v 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 - 40 - 20 0 20 40 60 80 100 temp [c] vdet [ a] vbat=vreg=5v fig 1. quiescent current fig 2. curr ent consumption fig 3. vreg voltage fig 4. under voltage lock out fig 6. switching frequency fig 7. max duty fig 8. lx nch ron fig 10. over voltage protect fig 12. vdet leak current fig 9. over current limit fig 11. sbd open protect fig 5. iset voltage
technical note 4/28 www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6150MUV fig 14. led current vs led voltage fig 13. led max current fig 15. led current matching fig 16. efficiency 10ledx6ch fig 17. led current vs pwm duty pwm freq=200hz led 10x6ch 30 35 40 45 50 34567 vbat [v] iled max [ma] -40 25 85 0 2 4 6 8 10 12 14 16 18 20 0 0.2 0.4 0.6 0.8 1 vled [v] iled [ma] 85 -40 25 -3 -2 -1 0 1 2 3 0 20406080100 duty [%] m atching [%] 85 25 -40 40 50 60 70 80 90 100 0102030 vbat [v] efficiency [%] 85 -40 25 0.1 1 10 100 1 10 100 duty [%] iled [ma] 6v 12v, 26v
technical note 5/28 www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6150MUV block diagram fig.18 BD6150MUV block diagram application example fig.19 application example (10led 6parallel, switching frequency 750khz) vbat vreg reg tsd internal power supply 5.5v clam p pwmpow internal power control uvlo internal reset fsel fault detecto r failflag sw sw sbd open/ output short protect output over voltage protect led terminal open/short detector led return select led1 led2 led3 led4 led5 led6 vde t + - current sence over current protect pgnd soft start control sence osc + erramp pwm comp 6ch gnd current driver + - pwmdrv iset iset resistor driver gnd test ocpset n.c. n.c. n.c. pwmpow pwmdrv n.c. test fsel ocpset vreg sw sw failflag vbat vdet n.c. led1 led2 led3 led4 led5 led6 n.c. pgnd gnd gnd iset BD6150MUV 19.6ma 10led 6 parallel 1m 26.7k 10k 2.2f / 50v 4.7h 4.2v to 26v 1f battery or adapter f pwm =100hz~ 1khz 68k 10k pwm 2.2f pgnd vin=2.1v to 5.5v 22k
technical note 6/28 www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6150MUV pin assignment table pin no. pin name in/ out function terminal diagram 1 sw out switching tr drive terminal h 2 sw out switching tr drive terminal h 3 n.c. - no connect pin f 4 pgnd - pgnd for switching tr d 5 failflag out fail flag c 6 ocpset in current limiter setting a 7 vdet in detect input for sbd open and ovp a 8 test in test signal j 9 fsel in selection of frequenc y, ?l?: 1.25mhz, ?h?: 0.75mhz j 10 iset in resister connection for led current setting a 11 gnd - gnd for switching regulator b 12 n.c. in no connect pin f 13 led1 in current sink for led c 14 led2 in current sink for led c 15 led3 in current sink for led c 16 led4 in current sink for led c 17 led5 in current sink for led c 18 led6 in current sink for led c 19 n.c. in no connect pin f 20 gnd - gnd for current driver b 21 pwmdrv in pwm input pin for power on/off only driver g 22 vreg out regulator output / internal power-supply d 23 pwmpow in pwm input pin for power on/off e 24 vbat in battery input i pin vbat vreg gnd a pin vbat pgnd b pin gnd c pin vbat gnd d pin vbat gnd e 5.5v clump pin vbat vreg gnd j pin vbat gnd g pin pgnd h pin pgnd i gnd pin f
technical note 7/28 www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6150MUV description of functions 1) pwm current mode dc/dc converter while this ic is power on, the lowest voltage of led te rms is detected, pwm duty is decided to be 0.7v and output voltage is kept invariably. as for the inputs of the pwm co mparator as the feature of the pwm current 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 sub harmonic oscillati on. this output controls internal nch tr via the rs latch. in the period where internal nch tr gate is on, energy is accumulated in the external inductor, and in the period where internal nch tr gate is off, energy is transferred to the output capacitor via external sbd. this ic has many safety functions, and their det ection signals stop switching operation at once. 2) soft start this ic 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 pwmpow, pwmdrv is changed l ? h, soft start becomes effective for within 4ms 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 4ms, 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 pwmpow, pwmdrv ? l. pwmpow max 1ms max 3ms off on off off vreg soft start pwmpow off on on off off off on off off pwmdrv vreg soft start soft start reset reset reset fig.20 soft start fig.21 soft start reset and set 3) failflag when the error condition occurs, boost operating is stopped by the protection function, and the error condition is outputted from failflag. after power on, when the protec tion function is operating under about 1ms have passed. object of protect function is as shown below. ? over-voltage protection ? external sbd open detect/ output short protection ? led terminal open/short protection ? over current limit off normal boost stop normal off normal un-detection detect un-detection about 1ms failflag pwmpow protection function boost operating fig.22 failflag operating description
technical note 8/28 www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6150MUV protection ? over voltage protection at such an error of output open as t he output dc/dc and the led is not connected 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 works, and turns off the output tr, and the pressure up made stop. at this moment, the ic changes from activation into non-ac tivation, and the output voltage goes down slowly. and, when the feedback of led1 isn?t returned, so th at vout will return normal voltage. vou t led1 voltage led1 connection led2 connection led1 feedbac k pwmpow, pwmdr v normal return return off normal open fig.23 vdet operating description ? external sbd open detect / output short protection in the case of external sbd is not connected to ic, or vout is shorted to gnd, the coil or in ternal tr may be destructed. therefore, at such an error as vdet becoming 0.05v or below, and turns off the out put 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). ? thermal shut down this ic has thermal shut down function. the thermal shut down works at 175 or higher, and the ic changes from activation into non-activation.
technical note 9/28 www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6150MUV how to set over voltage limit this section is especially mentioned here because the spec shown electrical charac teristic is necessary to explain this section. over voltage limit min 0. 96v typ 1.00v max 1.04v led control voltage min 0.56v typ 0.70v max 0.84v led terminal over voltage protect min 10.0v typ 11.5 v max 13.0v 1. calculate the conditions that t he total value of led vf is max. example) in the case of serial 8 leds with vf =2.9v(min), 3.2v(typ), 3.5v(max) => 3.5v x 8=28v 2. then calculate the biggest value of output with the following formula. the biggest value of output = the biggest value calculated for 1 + the biggest value of led terminal voltage. (0.84v) example) the biggest value of output = 28v + 0.84v =28.84v 3. set the smallest value of over voltage larger than the biggest value of output. if over voltage is closer to the total value of vf, it could be occurred to detect over voltage by ripple, noise, and so on. it is recommended that some margins should be left on the difference between over voltage and the total value of vf. this time around 6% margin is placed. example) against the biggest value of output = 28. 84v, the smallest value of over voltage = 28.84v x 1.06 = 30.57v ic over voltage limit min=0.96v,typ=1.00v, max=1.04v typ = 30.57v (1.00v/0.96v) = 31.8v max = 31.8v (1.04v/1.00v) = 33.1v 4. the below shows how to control resistor setting over voltage please fix resistor 2.2m between vdet and output and then set over voltage after changing resistor between vdet and gnd. while pwm is off, output voltage decreases by minimi zing this resistor. due to t he decrease of output voltage, ripple of output voltage increases, and singing of output condenser also becomes bigger. example) selecting ovp resistor. (example 1) vf=3.6v max, serial = 7 led ovp = 1.0v, r1 = 2.2m ? , r2 = 78.7k ? vout = 1.0 (2.2m ? + 78.7k ? )/ 78.7k? = 28.95v (example 2) vf=3.6v max, serial = 8 led ovp = 1.0v, r1 = 2.2m ? , r2 = 69.8k ? vout = 1.0 (2.2m ? + 69.8k ? )/ 69.8k? = 32.52 (example 3) vf=3.6v max, serial = 9 led ovp = 1.0v, r1 = 2.2m ? , r2 = 62k ? vout = 1.0 (2.2m ? + 62k ? )/ 62k? = 36.48v (example 4) vf=3.6v max, serial = 10 led ovp = 1.0v, r1 = 1.0m ? , r2 = 26.7k ? vout = 1.0 (1.0m ? + 26.7k ? )/ 26.7k? = 38.45v 5. the following shows how to confirm if leds are no t turned on while selecting terminals. if the difference between the vf?s total value of led and over voltage is less than min. 10v of led terminal over voltage protect, leds should be turned on. leds are turned on, as the following formula shows; 33.1v-2.9v x 8 serial = 9.9v<10.0v. vdet vout r1 r2
technical note 10/28 www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6150MUV ? over current limit over current flows the current detection re sistor that is connected to internal switching transistor source and between pgnd, current sense voltage turns more than detection vo ltage decided with ocpset, over current protection is operating and it is prevented from flowi ng more than detection current by reducing on duty of switching tr without stopping boost. as over current detector of this ic is detected peak current, current more than over current setting value does not flow. and, over current value can decide freely by changing ocpset voltage. the range of over current setting is from 0.5a to 2.5a. r (ocpset)=34k ? over current setting typ value of over current is 2a, min = 1.4a and max = 2.6a and after the current value which was necessary for the normal operat ion was decided, detection resist or is derived by using min value of over current detection value. for example, detection resistor when typ value was set at 2a is given as shown below. detection resistor =34k ? 2a=68k ? max current dispersion of this detection resistor value is max current = 2a1.3=2.6a for example, 34k ? ? 1a, 68k ? ? 2a as over current detector of this ic is detected the peak current, it have to estimate peak current to flow to the coil by operating condition. in case of, supply voltage of coil = vin inductance value of coil = l switching frequency = fsw min=1.0mhz, typ=1.25mhz, max=1.5mhz output voltage = vout total led current = iout average current of coil = iave peak current of coil = ipeak efficiency = eff on time of switching transistor = ton ipeak = (vin / l) (1 / fsw) (1-(vin / vout)) iave=(vout iout / vin) / eff ton=(iave (1-vin/vout) (1/fsw) (l/vin) 2) 1/2 each current is calculated. as peak current varies according to whether there is the direct current superposed, the next is decided. (1-vin/vout) (1/fsw) < ton ? peak current = ipeak /2 + iave (1-vin/vout) (1/fsw) > ton ? peak current = (vin / l) ton (example 1) in case of, vin=6.0v, l=4.7h, fsw=1. 25mhz, vout=39v, iout=80ma, efficiency=85% ipeak = (6.0v / 4.7h) (1 / 1.25mhz) (1-(6.0v / 39v)) =0.86a iave = (39v 80ma / 6.0v) / 85% = 0.61a ton = (0.61a (1-6.0v / 39v) (1 / 1.25mhz) (4.7h /6.0v) 2) 1/2 = 0.81s (1-vin/vout) (1 /fsw)=0.68s < ton peak current = 0.68a/2+0.61a = 1.04a (example 2) in case of, vin=12.0v, l=4.7h, fsw=1. 25mhz, vout=39v, iout=80ma, efficiency=85% ipeak = (12.0v / 4.7h) (1 / 1.25mhz) (1-(12v / 39v)) =1.41a iave = (39v 80ma / 12.0v) / 85% = 0.31a ton = (0.31a (1-12 v / 39v) (1 / 1.25mhz) (4.7h /12v) 2) 1/2 = 0.36s (1-vin/vout) (1 /fsw)=0.55s > ton peak current = 12v/4.7h 0.36s = 0.92a * when too large current is set, output overshoot is caused, be careful enough because it is led to break down of the ic in case of the worst. current sence ocpset + - detect r(ocpset) fig. 24 architecture
technical note 11/28 www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6150MUV ? soft start of over current limit for application when the capacitor of ocpset is set as figure, ov er current limit can become setting value slowly. this effect is same as internal soft start. when you want to reduce peak current than internal soft start on start up, this way is effective. but, this action repeat when the timing that pwmpow change l to h, so to do pwm control with pwmpow terminal, rise time of over current limit must be set into hi time of pwm control, and please don?t connect the capacitor. show example of rising wave form with ocpset 330pf. fig.25 rising wave form with vbat=5v, 6parallel 10serial 20ma/ch, ocpset=68k ,330pf current sence ocpset + - de tec t r(ocpset) 1.5a vout pwmpow coil current ocpset 36m
technical note 12/28 www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6150MUV operating of the application deficiency 1) when 1 led or 1string open during the operating the led string that became open isn't light ing, but other led strings are lighting. then led terminal is 0v, output boosts up to the over voltage pr otection voltage. when over vo ltage is detected, the feedback of open string isn?t returned, so that vout will return normal voltage. in the case that the voltage of 2 led terminals becomes more than 25v(absol ute maximum ratings) as vout boosts up to the over voltage protection voltage, please pay attention carefully that 2 led terminals could be broken up in setting over voltage protection. fig.26 led open detect moreover, excessively high level of over voltage limit in terminal setting makes it happen that led terminal voltage exceeds led terminal over voltage protect, which accordingly turn off led lights. in order to prevent this problem, please see ?how to set the external resistor of over voltage limit (p.7)? and then set over voltage referring to application. 2) when led short-circuited in the plural all led strings is turned on unless led1~6 terminal voltage is more than 11.5v. when it was more than 11.5v only the strings which short-circ uited is turned off normally and led current of other lines continue to turn on. fig.27 led short detect 3) when schottky diode comes off ic and a switching transistor aren't destroyed because boost operating stops by the schottky diode coming off protected function. 4) when the resistor of over current detection comes off all the leds do not turn on due to op en protect of the ovp resistor, which stops boost operation and consequently prevents passing led current. led1 led2 led 1 led 2 led1 12.7v led 1 feedbac k i led1 normal cut i led2 20ma 20ma 0ma vout 0.7v led short led2 40 35 30 25 20 15 10 5 0 10 20 30 40 led vf (vout) ovp setting when selecting terminals over voltage protection voltage setting range of over voltage protection vou t led1 voltage led 1 connection led connection led 1 feedbac k pwmpow, pwmdr v normal return return off normal open led 1curren t 20ma 0ma led 2 curren t 20ma led2 voltage 40 35 30 25 20 15 10 5 0 10 20 30 40 led vf (vout) led short-circuited led terminal voltage voltage range of le d short-circuited
technical note 13/28 www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6150MUV how to activate please pay attention to the following when activating. 1. the lights are turned off by led terminal over voltage pr otection in the case that led terminal voltage is more than 11.5v(typ) at pwmdrv=h. led terminal becomes more than 11.5v depending on ovp setting. in that case, please refer to how to set on p7. 2. in the case that capacitors are placed between anode and casode, led terminal might become more than 11.5v depending on power supply activating time. please make t12 in fig.28 long enough until led terminal becomes less than 11.5v. or use application. 3. if pwmpow and pwmdrv terminal voltage become more than vbat voltage in the case that activation of power supply voltage (vbat) is not completely finished, error might be occurred by supplying power supply into vbat via esd protection diode on the vbat side of each terminal. fig.28 shows input timing of vbat, pwmpow, and pwmdrv. please in put signal paying attention to the above. in the case that conditions are not good enou gh, it happens that lights are turned off at activation. terminal select circuit inside ic operates using vreg as power supply. in the case that vreg does not activate (less than uvlo), please set pwmdrv=h t12 hours after setting pwmpow=h. terminal select circuit is reset by pwmdrv=l signal while vreg rises after pwmpow=l->h. lights might be tur ned off unless pwmdrv=l is input until vreg becomes stable at activation. after activation, vreg voltage is more than uv lo, reset is not needed since terminal information is saved. name unit min. typ. max. t1 power supply activating time s 100 - - t2 power supply-pwmpow time s 0 - - t3 pwmpow rising time s 0 - 100 t4 pwmpow falling time s 0 - 100 t5 pwmpow low time s 50 - - t6 power supply-pwmdrv time s 1600 - - t7 pwmdrv rising time s 0 - 100 t8 pwmdrv high time s 5 - - t9 pwmdrv falling time s 0 - 100 t10 pwmdrv low time s 5 - - t11 pwmdrv cycle s 40 5000 10000 t12 pwmpow cycle s 1000 5000 10000 t13 pwmpow high time s 50 - - t14 pwmpow(h)->pwmdrv(h) time s 1500 - - t15 pwmpow(l)->pwmdrv(l) time s 0 - - t16 pwmdrv(l)->pwmpow(l) time s 0 - - h operation voltage v 4.2 12 26 l non operation voltage v - - 4.2 fig.28 input timing gnd vbat pin rin 0v 5v 10k ? fig.29 example of application at control signal voltage > vbat voltage a t light dimming of pwmdrv terminal a t light dimming of pwmpow terminal l[v] vba t vreg pwmpow t1 h[v] t2 t3 t14 t6 t10 uvlo t7 t9 t14 t4 t5 h[ v ] pwmdrv t3 t12 t13 t15 t16 l[v] vbat vreg pwmpow t1 h[v] t2 t3 t14 t6 t10 t11 t7 t9 t8 t4 t5 h [ v ] pwmdrv t14 t3 t15 t16
technical note 14/28 www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6150MUV start control (pwmpow) and select led current driver (pwmdrv) this ic can control the ic system by pwmpow, and ic can power off compulsory by setting 0.9v or below. also, it powers on pwmpow is at more than 2.1v. after it?s selected to pwmpow=h, when it is selected at pwmdrv=h, led current decided with iset resistance flow. next, when it is selected at pwmdrv=l, led current stop to flow. pwmpow pwmdrv ic led current l l off off h l on off l h off off h h on current decided with iset how to select the number of led lines of the current driver when the number of led lines of the curr ent driver is reduced, the un-select can be available by setting the unnecessary led1~6 terminals open. in the case of using 4 lines and so on, please connect the unnecessary 2 lines open. then please set pwmpow and pwmdrv ?h? and finish selecting the lines within the process of softstart. if the level of over voltage limit is set too high, the connected led lines exceed led terminal over voltage protect and are judged as unnecessary lines. please make it sure referring ?how to set over voltage limit (p.7)?. additionally, once the terminals are judged as unnecessary, th is information never can be reset without setting pwmpow and pwmdrv ?l?. led current setting range led current can set up normal current by resist ance value (riset) connecting to iset voltage. setting of each led current is given as shown below. normal current = 16ma(27k ? /riset) also, normal current setting range is 10ma~30ma. led curr ent becomes a leak current max 2a at off setting. when using beyond current setting range, please be careful that the error in led current setting could be large. iset normal current setting example riset led current 18k ? (e24) 24.0ma 22k ? (e24) 19.6ma 24k ? (e24) 18.0ma 27k ? (e24) 16.0ma 30k ? (e24) 14.4ma 33k ? (e24) 13.1ma 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 whic h 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 74.8% 0.04% power control 91% 0.40%
technical note 15/28 www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6150MUV 1) current driver pwm control is controlled by prov iding pwm signal to pwmdrv, as it is shown fig.30. the current set up with iset is chosen as the h section of pwmdrv and the current is off as the l section. therefore, the average led current is increasing in proportion to duty cycl e of pwmdrv signal. this method that it lets internal circuit and dc/dc to work, because it becomes to switch the driver, the current tolerance is a few when the pwm brightness is adjusted, so it makes it possible to brightness control until 5s (min0.1% at 200 hz). and, don't use for the brightness control, because effect of is et changeover is big under 1s on time and under 1s off time. typical pwm frequency is 100hz~25khz. 2) power control pwm control is controlled by providing pwm signal to pwmpow, as it is shown fig.31. the current setting set up with pwmdrv logic is chosen as the h section and the current is off as t he l 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~1khz. output voltage ripple for pwm dimming conditio 8serial 6parallel, led current=20ma/ch, vbat=7v, ta=25 , output capacitor=2.2 f(50v/b3) fig.32 output voltage ripple for pwm dimming pwmdrv led current coil current ic?s active current on off on off on off on pwmpow led current coil current ic?s active current on off on off on off on off fig.30 pwmdrv sequence fig.31 pwmpow sequence lower ripple voltage (under 200mv) pwmdrv output voltage (ac) input current 780ma 1ms/div.
technical note 16/28 www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6150MUV led current rise and fall for pwm dimming conditions 8serial 6parallel, led current=20ma/ch, vbat=7v, ta=25 , output capacitor=2.2 f(50v/b3) main characteristics of efficiency conditions 10serial 6parallel, led current =20ma/ch, output capacitor=2.2 f(50v/b3) fig.33 pwm characteristics of current driver pwm pwmdrv pwmdrv output voltage output voltage led current led current 624ns 400ns/div. 114ns 40ns/div. pwmdrv(ta 25, frequency 200hz, led 10x6ch) led current vs duty 0.001 0.01 0.1 1 10 100 0.1 1 10 100 duty[%] led current[ma] 12v 6v 26v pwmpow (ta 25, frequency 200hz led 10x6ch) led current vs duty 0.001 0.01 0.1 1 10 100 0.1 1 10 100 duty[%] led current[ma] 12v 6v 26v fig.34 pwm characteristics of power control pwm fig.36 efficiency of power control pwm fig.35 efficiency of current driver pwm ef ficiency for pwmpow control vbat=12v ta=25 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 10 0 % 0 102030 40 50607080 90100 pwm duty(%) eff iciency efficiency vs duty (10serial x 6strings) 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 0 10 2030405060 708090100 pw m du ty [%] effic iency 50 60 70 80 90 100 5 1015202530 vbat [v] efficiency [%] -40 25 85
technical note 17/28 www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6150MUV the coil selection the dc/dc is designed by more than 4.7h. when l value sets to a lower value, it is po ssibility that 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. the separation 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 26v. that application is shown in below fig.14. the higher voltage so urce is applied to the power source of coil that is connected from 4.2v to 5.5v into ic vbat, please follow the re commend design in fig.14. it connects vbat terminal and vreg terminal together at ic outside. when the coil power supply is applied, it is no any problem ev en though ic power supply is the state of 0v. although ic power supply is set to 0v, pull-down resistance is arranged fo r the power off which cuts off the leak route from coil power supply in ic inside, the leak route is cut off. and, there is no power on-off sequence of coil power supply and ic power supply . fig.37 application at the time of power supply isolation (6parallel) pwmpow pwmdrv n.c. f pwm =100h z ~1kh z test fsel ocpset 68k ? 27k ? 16ma 2.2f / 50v 4.7h 10f 4.2v to 30v 1f battery or adapter vreg s w s w fa il fl a g vba t vde t pgnd gnd gnd iset 2.2m ? 69.8k ? 10k ? pwm 10k ? 1f pgnd vin=2.1v to 5.5v 4.2v to 26v battery or adapter BD6150MUV 9led 6parallel n.c. led1 led2 led3 led4 led5 led6 n.c. pwmpow pwmdrv n.c. f pwm =100h z ~1kh z test fsel ocpset 68k ? 27k ? 16ma 2.2f / 50v 4.7h 10f 4.2v to 30v 1f battery or adapter vreg s w s w fa il fl a g vba t vde t pgnd gnd gnd iset 2.2m ? 69.8k ? 10k ? pwm 10k ? 2.2f pgnd vin=2.1v to 5.5v 4.2v to 5.5v battery BD6150MUV 9led 6parallel n.c. led1 led2 led3 led4 led5 led6 n.c.
technical note 18/28 www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6150MUV selection of external parts recommended external parts are as shown below. when to use other parts than these, sele ct 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 tdk ltf5022t-4r7n2r0-lc 5.0 5.2 2.2 2000 0.073 10 h toko a915ay-100m 5.2 5.2 3.0 1870 0.090 10 h tdk ltf5022t-100m1r4-lc 5.0 5.2 2.2 1400 0.140 ? capacitor value pressure manufacturer product number size tc capa tolerance vertical horizontal height [ supply voltage capacitor ] 2.2 f 10v murata grm188b31a225k 1.6 0.8 0.80.1 b +/-10% 4.7 f 25v murata grm319r61e475k 3. 2 1.6 0.850.1 x5r +/-10% 4.7 f 25v murata grm21br61e475k 2. 0 1.25 1.250.1 x5r +/-10% 10 f 25v murata grm31cb31e106k 3.2 1.6 1.60.2 b +/-10% 10 f 10v murata grm219r61a106k 2.0 1.25 0.850.15 x5r +/-10% [ smoothing capacitor fo r built-in regulator ] 1 f 10v murata grm188b10j105k 1.6 0.8 0.80.1 b +/-10% 4.7 f 10v murata grm219b31a475k 2. 0 1.25 0.850.1 b +/-10% [ output capacitor ] 1 f 50v murata grm31mb31h105k 3.2 1.6 1.150.1 b +/-10% 1 f 50v murata grm21bb31h105k 2.0 1.25 1.250.1 b +/-10% 2.2 f 50v tdk c3225jb1h225k 3.2 2.5 2.0 0.2 b +/-10% 2.2 f 50v murata grm31cb31h225k 3.2 1.6 1.60.2 b +/-10% 0.33 f 50v murata grm219b31h334k 2. 0 1.25 0.850.1 b +/-10% ? resistor value tolerance manufacturer product number size vertical horizontal height 10k ? 0.5% rohm mcr03ezpd1002 1.6 0.8 0.45 15k ? 0.5% rohm mcr03ezpd1502 1.6 0.8 0.45 18k ? 0.5% rohm mcr03ezpd1802 1.6 0.8 0.45 22k ? 0.5% rohm mcr03ezpd2202 1.6 0.8 0.45 24k ? 0.5% rohm mcr03ezpd2402 1.6 0.8 0.45 27k ? 0.5% rohm mcr03ezpd2702 1.6 0.8 0.45 30k ? 0.5% rohm mcr03ezpd3002 1.6 0.8 0.45 33k ? 0.5% rohm mcr03ezpd3302 1.6 0.8 0.45 56k ? 0.5% rohm mcr03ezpd5602 1.6 0.8 0.45 62k ? 0.5% rohm mcr03ezpd6202 1.6 0.8 0.45 68k ? 0.5% rohm mcr03ezpd6802 1.6 0.8 0.45 75k ? 0.5% rohm mcr03ezpd7502 1.6 0.8 0.45 2.2m ? 0.5% rohm mcr03ezpd2204 1.6 0.8 0.45 ?sbd pressure manufacturer product number size vertical horizontal height 60v rohm rb160m-60 3.5 1.6 0.8 the coil is the part that is mo st influential to efficiency. select the coil wh ose direct current resist or (dcr) and current - inductance characteristic is excellent. bd6xxx is designed for the inductance value of 4.7h. don?t use the inductance value. less than 3.3 h. select a capacitor of cerami c type with excellent frequency and temperature characteristics. further, select capacitor to be used with small direct current resistance, and pay sufficient attention to the pcb layout.
technical note 19/28 www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6150MUV pcb layout in order to make the most of the performanc e of this ic, its pcb layout is very im portant. characteristics such as efficiency and ripple and the likes change greatly with la yout patterns, which please note carefully. fig. 38 pcb layout connect input capacitor cvl1 (10 f) as close as possible between coil l1 and pgnd. put input bypath capacitor cvb1 (1 f) as close as possible between vbat and pgnd pin. connect smoothing capacitor cvr3(2.2 f) as close as possible between vreg pin and pgnd. connect schottky barrier diode sbd as close as possible between coil1and sw pin. connect output capacitor co1 between cathode of sbd and pgnd. make both pgnd sides of cvl1 and co1 as close as possible. > connect led current setting resistor riset(22k ) as close as possible between iset pin and gnd. there is possibility to oscillate when capacity is added to iset terminal, so pay attention that capacity isn't added. connect over current limit setting resistor roc(68k ) as close as possible be tween ocpset pin and gnd. < over current limit setting resistor rvt(2.2m ? ) & rvd(56k ? )> put over current limit setting resistor rvt(2.2m ) & rvd(56k ) as close as possible vdet pin so as not to make the wire longer, which possibly causes the noise and also detects over voltage protection by mistake. gnd is analog ground, and pgnd is power gr ound. pgnd might cause a lot of noise due to the coil current of pgnd. try to connect with analog ground, after smoothing with input capacitor cvl1 and output capacitor co1. pad is used for improving the efficiency of ic heat r adiation. solder pad to gnd pin (analog ground). moreover, connect ground plane of board using via as shown in the patterns of next page. the efficiency of heat radiation improves according to the area of ground plane. when those pins are not connect ed directly near the chip, influence is give to the performance of bd6150, 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. the layout pattern in consideration of thes e is shown in the next page. pwmpow pwmdrv n.c. f pwm =100h z ~1khz test fsel ocpset 68k ? 22k ? 19.6ma BD6150MUV 2.2f / 50v 4.7h 10f 4.2v to 26v 1f battery or adapter 10led 6parallel vreg s w s w fa il fla g vba t vde t n.c. led1 led2 led3 led4 led5 led6 n.c. pgnd gnd gnd iset 1m ? 26.7k ? 10k ? pwm 10k ? 2.2f pgnd vin=2.1v to 5.5v cvl1 cvb1 cvr3 co1 riset roc rvd rvt
technical note 20/28 www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6150MUV recommended pcb layout pattern top layer mid layer 1 mid layer 2 bottom layer fig. 39 pcb layout patterns about heat loss in heat design, operate the dc/dc conv erter in the following condition. (the following temperature is a guarantee te mperature, so consider the margin.) 1. ambient temperature ta must be less than 85 . 2. the loss of ic must be less than dissipation pd. 4r7 76 d6150 l l 1 1 4.7h c c _ _ v v l l 1 1 10f/25v c c o o 1 1 2.2f/50v s s b b d d 60v u u 1 1 BD6150MUV r r _ _ o o c c 56k ? r r _ _ v v d d 26.7k ? r r _ _ i i s s e e t t 22k ? r r _ _ v v t t 1 m ? c c _ _ v v r r 3 3 2.2f/10v c c _ _ v v b b 1 1 2.2f/25v
technical note 21/28 www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6150MUV application example ? led current setting controlled iseth resistor. 21.5k ? : 20.1ma 27.0k ? : 16.0ma 14.7k ? : 29.59ma ? brightness control please input pwm pulse from pwmpow or pwmdrv terminal. please refer electrical characteristics p.3 and function (p.12). 15inch panel fig.41 10 series 6 parallel, led current16ma, switching frequency 1250khz example power control pwm application pwmpow pwmdrv n.c. f pwm =100hz~1kh z test fsel ocpset 68k ? 27k ? 16ma BD6150MUV 2.2f / 50v 4.7h 10f battery or adapter 1f 10led 6parallel vreg s w s w fa il fl a g vba t vde t n.c. led1 led2 led3 led4 led5 led6 n.c. pgnd gnd gnd iset 1m ? 26.7k ? 10k ? pwm 10k ? 2.2f pgnd led on/off like enable 10k ? pwmpow pwmdrv n.c. f pwm =100hz~1kh z test fsel ocpset 68k ? 27k ? 16ma BD6150MUV 2.2f / 50v 4.7h 10f batter y or ada p ter 1f 10led 6parallel vreg s w s w fa il fl a g vba t vde t n.c. led1 led2 led3 led4 led5 led6 n.c. pgnd gnd gnd iset 1m ? 26.7k ? 10k ? pwm 10k ? 2.2f pgnd led on/off like enable 10k ? pwmpow pwmdrv n.c. f pwm =100h z ~25khz test fsel ocpset 68k ? 27k ? 16ma BD6150MUV 2.2f / 50v 4.7h 10f batter y or ada p te r 1f 10led 6parallel vreg s w s w fa il fl a g vba t vde t n.c. led1 led2 led3 led4 led5 led6 n.c. pgnd gnd gnd iset 1m ? 26.7k ? 10k ? pwm 10k ? 2.2f pgnd led on/off enable 330pf 10k ? fig.40 10 series 6parallel, led current 16ma setting switching frequency 750khz setting example power control pwm application pwmpow pwmdrv n.c. f pwm =100h z ~25khz test fsel ocpset 68k ? 27k ? 16ma BD6150MUV 2.2f / 50v 4.7h 10f batter y or ada p te r 1f 10led 6parallel vreg s w s w fa il fl a g vba t vde t n.c. led1 led2 led3 led4 led5 led6 n.c. pgnd gnd gnd iset 1m ? 26.7k ? 10k ? pwm 10k ? 2.2f pgnd led on/off enable 330pf 10k ? fig.42 10 series 6parallel, led current 16ma setting switching frequency 750khz setting example current driver pwm application fig.43 10 series 6parallel, led current 16ma setting switching frequency 1250khz setting example current driver pwm application
technical note 22/28 www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6150MUV 13~14inch panel 10~12inch panel pwmpow pwmdrv n.c. f pwm =100hz~1kh z test fsel ocpset 56k ? 27k ? 16ma BD6150MUV 2.2f / 50v 4.7h 10f batter y or ada p ter 1f 8led 6parallel vreg s w s w fa il fl a g vba t vde t n.c. led1 led2 led3 led4 led5 led6 n.c. pgnd gnd gnd iset 2.2m ? 69.8k ? 10k ? pwm 10k ? 2.2f pgnd led on/off like enable 10k ? fig.44 8series 6paralell led current 16ma setting, switching frequency 1250khz setting example power control pwm application fig.45 8series 6paralell, led current 16ma setting, switching frequency 1250khz setting example current driver pwm application pwmpow pwmdrv n.c. f pwm =100h z ~25khz test fsel ocpset 56k ? 27k ? 16ma BD6150MUV 2.2f / 50v 4.7h 10f batter y or ada p te r 1f 8led 6parallel vreg s w s w fa il fl a g vba t vde t n.c. led1 led2 led3 led4 led5 led6 n.c. pgnd gnd gnd iset 2.2m ? 69.8k ? 10k ? pwm 10k ? 2.2f pgnd led on/off enable 330pf 10k ? pwmpow pwmdrv n.c. f pwm =100hz~1kh z test fsel ocpset 47k ? 27k ? 16ma BD6150MUV 2.2f / 50v 4.7h 10f batter y or ada p ter 1f 7led 6parallel vreg s w s w fa il fl a g vba t vde t n.c. led1 led2 led3 led4 led5 led6 n.c. pgnd gnd gnd iset 2.2m ? 78.7k ? 10k ? pwm 10k ? 2.2f pgnd led on/off like enable 10k ? fig.46 7series 6parallel, led current 16ma setting, switching frequency 1250khz setting example power control pwm application
technical note 23/28 www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6150MUV 7inch panel pwmpow pwmdrv n.c. f pwm =100hz~1kh z test fsel ocpset 39k ? 27k ? 16ma BD6150MUV 2.2f / 50v 4.7h 10f batter y or ada p ter 1f 8led 3parallel vreg s w s w fa il fl a g vba t vde t n.c. led1 led2 led3 led4 led5 led6 n.c. pgnd gnd gnd iset 2.2m ? 69.8k ? 10k ? pwm 10k ? 2.2f pgnd led on/off like enable 10k ? fig.47 8series 3parallel, led current 16ma setting, switching frequency 1250khz setting example power control pwm application pwmpow pwmdrv n.c. f pwm =100hz~1kh z test fsel ocpset 39k ? 27k ? 16ma BD6150MUV 2.2f / 50v 4.7h 10f batter y or ada p ter 1f 6led 4parallel vreg s w s w fa il fl a g vba t vde t n.c. led1 led2 led3 led4 led5 led6 n.c. pgnd gnd gnd iset 2.2m ? 69.8k ? 10k ? pwm 10k ? 2.2f pgnd led on/off like enable 10k ? fig.48 6series 4parallel, led current 16ma setting, switching frequency 1250khz setting example power control pwm application pwmpow pwmdrv n.c. f pwm =100hz~1kh z test fsel ocpset 56k ? 21.5k ? 40.2ma BD6150MUV 2.2f / 50v 4.7h 10f batter y or ada p ter 1f 8led 3parallel vreg s w s w fa il fl a g vba t vde t n.c. led1 led2 led3 led4 led5 led6 n.c. pgnd gnd gnd iset 2.2m ? 69.8k ? 10k ? pwm 10k ? 2.2f pgnd led on/off like enable 10k ? fig.49 8series 3parallel, led current 40.2ma setting, switching frequency 1250khz setting example power control pwm application
technical note 24/28 www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6150MUV 5inch panel pwmpow pwmdrv n.c. f pwm =100hz~1kh z test fsel ocpset 33k ? 27k ? 16ma BD6150MUV 2.2f / 50v 4.7h 10f batter y or ada p ter 1f 8led 2parallel vreg s w s w fa il fl a g vba t vde t n.c. led1 led2 led3 led4 led5 led6 n.c. pgnd gnd gnd iset 2.2m ? 69.8k ? 10k ? pwm 10k ? 2.2f pgnd led on/off like enable 10k ? fig.50 8series 2parallel, led current 16ma setting, switching frequency 1250khz setting example power control pwm application pwmpow pwmdrv n.c. f pwm =100hz~1kh z test fsel ocpset 47k ? 21.5k ? 40.2ma BD6150MUV 2.2f / 50v 4.7h 10f batter y or ada p ter 1f 8led 2parallel vreg s w s w fa il fl a g vba t vde t n.c. led1 led2 led3 led4 led5 led6 n.c. pgnd gnd gnd iset 2.2m ? 69.8k ? 10k ? pwm 10k ? 2.2f pgnd led on/off like enable 10k ? fig.51 8series 2parallel, led current 40.2ma setting, switching frequency 1250khz setting example power control pwm application pwmpow pwmdrv n.c. f pwm =100hz~1kh z test fsel ocpset 68k ? 14.7k ? 88.8ma BD6150MUV 2.2f / 50v 4.7h 10f batter y or ada p ter 1f 8led 2parallel vreg s w s w fa il fl a g vba t vde t n.c. led1 led2 led3 led4 led5 led6 n.c. pgnd gnd gnd iset 2.2m ? 69.8k ? 10k ? pwm 10k ? 2.2f pgnd led on/off like enable 10k ? fig.52 8series 2parallel, led current 88.8ma setting, switching frequency 1250khz setting example power control pwm application
technical note 25/28 www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6150MUV pwmpow pwmdrv n.c. f pwm =100hz~1kh z test fsel ocpset 33k ? 27k ? 16ma BD6150MUV 2.2f / 50v 4.7h 10f batter y or ada p ter 1f 3led 5parallel vreg s w s w fa il fl a g vba t vde t n.c. led1 led2 led3 led4 led5 led6 n.c. pgnd gnd gnd iset 2.2m ? 187k ? 10k ? pwm 10k ? 2.2f pgnd led on/off like enable 10k ? fig.53 3series 5parallel, led current 16ma setting, switching frequency 1250khz setting example power control pwm application pwmpow pwmdrv n.c. f pwm =100hz~1kh z test fsel ocpset 47k ? 14.7k ? 177.6ma BD6150MUV 2.2f / 50v 4.7h 10f batter y or ada p ter 1f 3led 6parallel vreg s w s w fa il fl a g vba t vde t n.c. led1 led2 led3 led4 led5 led6 n.c. pgnd gnd gnd iset 2.2m ? 187k ? 10k ? pwm 10k ? 2.2f pgnd led on/off like enable 10k ? fig.55 3series 6parallel, led current 177.6ma setting, switching frequency 1250khz setting example power control pwm application pwmpow pwmdrv n.c. f pwm =100hz~1kh z test fsel ocpset 68k ? 14.7k ? 177.6ma BD6150MUV 2.2f / 50v 4.7h 10f batter y or ada p ter 1f 10led 1parallel vreg s w s w fa il fl a g vba t vde t n.c. led1 led2 led3 led4 led5 led6 n.c. pgnd gnd gnd iset 1m ? 26.7k ? 10k ? pwm 10k ? 2.2f pgnd led on/off like enable 10k ? fig.56 10series 1parallel, led current 177.6ma setting, switching frequency 1250khz setting example power control pwm application pwmpow pwmdrv n.c. f pwm =100hz~1kh z test fsel ocpset 47k ? 14.7k ? 29.6ma BD6150MUV 2.2f / 50v 4.7h 10f batter y or ada p ter 1f 3led 6parallel vreg s w s w fa il fl a g vba t vde t n.c. led1 led2 led3 led4 led5 led6 n.c. pgnd gnd gnd iset 2.2m ? 187k ? 10k ? pwm 10k ? 2.2f pgnd led on/off like enable 10k ? fig.54 3series 6parallel, led current 29.6ma setting, switching frequency 1250khz setting example power control pwm application
technical note 26/28 www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6150MUV application example of analog dimming control led current to charged d/a voltage. show application example and typ control. please decide final value after you evaluated application, characteristic. ledcurrent = 432 470k ? + 22k ? 432 typ ledcurrent = 432 470k ? + 1- dac isetvoltage 22k ? 432 1- dac 0.6v fig. 57 bd6150 analog style optical application pwmpow pwmdrv n.c. test fsel ocpset 68k ? 470k ? 20ma BD6150MUV 1f 2.2f / 50v 4.7h 10f 4.2v to 26v 1f battery or adapter 10led 6parallel vreg s w s w fa il fl a g vba t vde t n.c. led1 led2 led 3 led4 led 5 led 6 n.c. pgnd gnd gnd iset 2.2m ? 56k ? 10k ? 10k ? 1f gnd pgnd vin=2.1v to 5.5v 22k ? d/a power on/off 330pf gnd
technical note 27/28 www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6150MUV notes for use (1) absolute ma ximum ratings an excess in the absolute maximum ratings, such as supply voltage, temperature range of operating conditions, etc., can break down devices, thus making impossible to identify breaking 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 prot ective measures against the breakdown due to the reverse connection, such as mounting 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 fr om that for the analog bl ock, thus suppressing the diffraction of digital noises to the analog block power su pply 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 capacito r, thoroughly check to be sure the characteristics of the capacitor to be used present no problem including the occurr ence 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 the 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 connect ed to a low-impedance ic terminal, the ic can suffer stress. therefore, be sure to discharge from the set pcb by each pr ocess. 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, estab lish 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, parasitic elements are in evitably formed in relation to potential. the operation of the parasitic element can cause interference with circuit operati on, thus resulting in a malfunction and then breakdown of the input terminal. therefore, pay thorou gh attention not to handle the input te rminals, 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 vo ltage 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 voltage or within the guaranteed value of electr ical characteristics. (10) ground wiring pattern if small-signal gnd and large-current g nd 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 l arge current will cause no fluctuations in voltages of the small-signal gnd. pay att ention 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 wi th consideration given to a degradation in the nominal capacitance due to dc bias and c hanges in the capacitance due to temperature, etc. (12) thermal shutdown circuit (tsd) when junction temperatures become 175 (typ) or higher, the thermal 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 guar antee of the lsi. therefor e, do not continuously use the ls i 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.
technical note 28/28 www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6150MUV ordering part number b d 6 1 5 0 m u v - e 2 part no. bd part no. 6150 package muv: vqfn024v4040 packaging and forming specification e2: embossed tape and reel (unit : mm) vqfn024v4040 0.08 s s 16 7 12 19 24 13 18 0.40.1 0.02 +0.03 - 0.02 1pin mark 2.40.1 c0.2 0.5 4.00.1 0.75 2.40.1 4.00.1 1.0max (0.22) 0.25 +0.05 - 0.04 ? order quantity needs to be multiple of the minimum quantity. embossed carrier tape tape quantity direction of feed the direction is the 1pin of product is at the upper left when you hold reel on the left hand and you pull out the tape on the right hand 2500pcs e2 () direction of feed reel 1pin
r1120 a www.rohm.com ? 2011 rohm co., ltd. all rights reserved. notice rohm customer support system http://www.rohm.com/contact/ thank you for your accessing to rohm product informations. more detail product informations and catalogs are available, please contact us. notes no copying or reproduction of this document, in part or in whole, is permitted without the consent of rohm co.,ltd. the content specied herein is subject to change for improvement without notice. the content specied herein is for the purpose of introducing rohm's products (hereinafter "products"). if you wish to use any such product, please be sure to refer to the specications, which can be obtained from rohm upon request. examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the products. the peripheral conditions must be taken into account when designing circuits for mass production. great care was taken in ensuring the accuracy of the information specied in this document. however, should you incur any damage arising from any inaccuracy or misprint of such information, rohm shall bear no responsibility for such damage. the technical information specied herein is intended only to show the typical functions of and examples of application circuits for the produc ts. rohm does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by rohm and other parties. rohm shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. the products specied in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, ofce-automation equipment, commu- nication devices, electronic appliances and amusement devices). the products specied in this document are not designed to be radiation tolerant. while rohm always makes efforts to enhance the quality and reliability of its products, a product may fail or malfunction for a variety of reasons. please be sure to implement in your equipment using the products safety measures to guard against the possibility of physical injury, re or any other damage caused in the event of the failure of any product, such as derating, redundancy, re control and fail-safe designs. rohm shall bear no responsibility whatsoever for your use of any product outside of the prescribed scope or not in accordance with the instruction manual. the products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuel- controller or other safety device). rohm shall bear no responsibility in any way for use of any of the products for the above special purposes. if a product is intended to be used for any such special purpose, please contact a rohm sales representative before purchasing. if you intend to export or ship overseas any product or technology specied herein that may be controlled under the foreign exchange and the foreign trade law, you will be required to obtain a license or permit under the law.

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