View EL7513IYZ_4190833.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

1 ? fn7112.4 el7513 white led step-up regulator the el7513 is a constant current boost regulator specially designed for driving white leds. it can drive 4 leds in series or up to 12 leds in parallel/series configuration and achieves efficiency up to 91%. the brightness of the leds is adjusted through a voltage level on the cntl pin. when the level falls below 0.1v, the chip goes into shut-down mode and consumes less than 1a of supply current for v in less than 5.5v. the el7513 is available in the 8 ld tsot and 8 ld msop packages. the tsot package is just 1mm high, compared to 1.45mm for the standard sot23 package. features ? 2.6v to 13.2v input voltage ? 18v maximum output voltage ? drives up to 12 leds ? 1mhz switching frequency ? up to 91% efficiency ? 1a maximum shut-down current ? dimming control ? 8 ld tsot and 8 ld msop packages ? pb-free plus anneal available (rohs compliant) applications ?pdas ? cellular phones ? digital cameras ? white led backlighting ordering information part number part marking tape & reel package pkg. dwg. # el7513iwt-t7 9 7? (3k pcs) 8 ld tsot mdp0049 el7513iwt-t7a 9 7? (250 pcs) 8 ld tsot mdp0049 el7513iwtz-t7 (see note) baaa 7? (3k pcs) 8 ld tsot (pb-free) mdp0049 el7513iwtz-t7a (see note) baaa 7? (250 pcs) 8 ld tsot (pb-free) mdp0049 el7513iy d - 8 ld msop mdp0043 el7513iy-t7 d 7? 8 ld msop mdp0043 el7513iy-t13 d 13? 8 ld msop mdp0043 EL7513IYZ (see note) baaba - 8 ld msop (pb-free) mdp0043 EL7513IYZ-t7 (see note) baaba 7? 8 ld msop (pb-free) mdp0043 EL7513IYZ-t13 (see note) baaba 13? 8 ld msop (pb-free) mdp0043 note: intersil pb-free plus anneal products employ special pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish , which are rohs compliant and compatible with both snpb and pb-free soldering operations. intersil pb-free products are msl classi fied at pb-free peak reflow temperatures that meet or exceed the pb-free requirements of ipc/jedec j std-020. data sheet march 14, 2006 caution: these devices are sensitive to electrosta tic discharge; follow proper ic handling procedures. 1-888-intersil or 1-888-468-3774 | intersil (and design) is a registered trademark of intersil americas inc. copyright intersil americas inc. 2004-2006. all rights reserved all other trademarks mentioned are the property of their respective owners.
2 pinouts typical connection el7513 (8 ld tsot) top view el7513 (8 ld msop) top view comp cntl vout lx vin cs sgnd pgnd 1 2 3 4 8 7 6 5 cs vin pgnd sgnd cntl comp lx vout 1 2 3 4 8 7 6 5 c 1 lx vin vout cs pgnd sgnd cntl comp 4.7f c 3 0.1f c 2 1f l 33h d 2.6v to 5.5v r 1 v ctrl 5 ? el7513
3 important note: all parameters having min/max specifications are guaranteed. typ values are for information purposes only. unles s otherwise noted, all tests are at the specified temperature and are pulsed tests, therefore: t j = t c = t a absolute maxi mum ratings (t a = 25c) comp, cntl, cs to sgnd. . . . . . . . . . . . . . . . . . . . . . -0.3v to +6v v in to sgnd . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+14v v out to sgnd . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+19v lx to pgnd . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+20v sgnd to pgnd . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3v to +0.3v storage temperature . . . . . . . . . . . . . . . . . . . . . . . .-65c to +150c ambient operating temperature . . . . . . . . . . . . . . . .-40c to +85c caution: stresses above those listed in ?absolute maximum ratings? may cause permanent damage to the device. this is a stress o nly rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. this part is esd sensitive. handle with care. electrical specifications v in = 3v, v o = 12v, c 1 = 4.7f, l = 33h, c 2 = 1f, c 3 = 0.1f, r 1 = 5 ? , t a = 25c, unless otherwise specified parameter description conditions min typ max unit v in input voltage 2.6 13.2 v i q1 total input current at shut-down v cntl = 0v 1 a i q1 quiescent supply current at v o pin v cntl = 1v, load disconnected 1 1.5 ma i comp comp pin pull-up current comp connected to sgnd 11 20 a v comp comp voltage swing 0.5 1.5 2.5 v i cntl cntl shut-down current cntl = 0v 1 a v cntl1 chip enable voltage 240 mv v cntl2 chip disable voltage 100 mv i out_accuracy v cntl = 1v v cntl = 1v 14 15 16 ma v out1 over-voltage threshold v out rising 17 18 19 v v out2 over-voltage threshold v out falling, with resistive load 15 16 17.5 v ilx mosfet current limit 500 ma r ds_on mosfet on-resistance 0.7 ? i leak mosfet leakage current v cntl = 0v, v lx = 12v 1 a f s switching frequency 800 1000 1200 khz d max maximum duty ratio v cntl = 2v, i s = 0 85 90 % i cs cs input bias current 1a ? i o / ? v in line regulation v in = 2.6v - 5.5v 0.03 %/v pin descriptions 8 ld tsot 8 ld msop pin name description 1 7 comp compensation pin. a compensation cap (4700pf to 1f) is normally connected between this pin and sgnd. 2 8 cntl control pin for dimming and shut-down. a voltage between 250mv and 5.5v controls the brightness, and less than 100mv shuts down the converter. 3 5 vout output voltage sense. use for over voltage protection. 4 6 lx inductor connection pin. the drain of internal mosfet. 5 3 pgnd power ground pin. the source of internal mosfet. 6 4 sgnd signal ground. ground pin for internal control ci rcuitry. needs to connect to pgnd at only one point. 7 1 cs current sense pin. connect to sensing resistor to set the led bias current. 8 2 vin power supply for internal control circuitry. el7513
4 block diagram reference generator 1mhz oscillator thermal shutdown boost i-sense start-up control + + - + + pwm signal c out 1f i(led) over-voltage protection error amp cntl comp v in c in 4.7f c comp 0.1f sgnd c s pgnd lx v out l 33h 2.6v to 5.5v 5 ? v cntl pwm logic 617k 50k typical performance curves all performance curves and waveforms are taken with c 1 = 4.7f, c 2 = 1f, c 3 = 0.1f, l = 33f, v in = 3.3v, v cntl = 1v, r 1 =5 ? , 4 leds in a series; unless otherwise specified. figure 1. switching frequency vs v in figure 2. quiescent current 1.05 1.04 1.02 1.01 1 2.5 3.5 4.5 v in (v) f s (mhz) 1.03 5.5 345 3.5 2 1 0 2.5 6.5 10.5 v in (v) i in (a) 3 14.5 4.5 8.5 12.5 2.5 1.5 0.5 v cntl =0v, 0.1v white leds disconnected el7513
5 figure 3. i led vs v cntl figure 4. i led vs v in figure 5a. 2 leds in a series figure 5b. efficiency vs i o figure 5. figure 6a. 3 leds in a series figure 6b. efficiency vs i o figure 6. typical performance curves (continued) all performance curves and waveforms are taken with c 1 = 4.7f, c 2 = 1f, c 3 = 0.1f, l = 33f, v in = 3.3v, v cntl = 1v, r 1 =5 ? , 4 leds in a series; unless otherwise specified. 0 5 10 15 20 25 30 35 0 0.5 1 1.5 2 2.5 v cntl (v) i led (ma) 14 14.2 14.4 14.6 14.8 15 15.2 15.4 15.6 15.8 16 2.53.54.55.5 v in (v) v cntl =1v i led (ma) 34 5 lx vin vout cs pgnd sgnd cntl comp 4.7f 0.1f 1f l 33h bat54ht1 v in 25 16 3 7 4 8 v ctrl 5 ? 2 leds in a series 90 85 80 75 70 5 1015202530 i o (ma) efficiency (%) l=coilcraft lpo1704-333cm v in =4.2v v in =2.7v lx vin vout cs pgnd sgnd cntl comp 4.7f 0.1f 1f l 33h bat54ht1 v in 25 16 3 7 4 8 v ctrl 5 ? 3 leds in a series 90 85 80 75 70 5 1015202530 i o (ma) efficiency (%) l=coilcraft lpo1704-333cm v in =4.2v v in =2.7v el7513
6 figure 7a. 4 leds in a series figure 7b. efficiency vs i o figure 7. figure 8a. 2 legs of 2 leds in a series figure 8b. efficiency vs i o figure 8. figure 9a. 2 legs of 3 leds in a series figure 9b. efficiency vs i o figure 9. typical performance curves (continued) all performance curves and waveforms are taken with c 1 = 4.7f, c 2 = 1f, c 3 = 0.1f, l = 33f, v in = 3.3v, v cntl = 1v, r 1 =5 ? , 4 leds in a series; unless otherwise specified. lx vin vout cs pgnd sgnd cntl comp 4.7f 0.1f 1f l 33h bat54ht1 v in 25 16 3 7 4 8 v ctrl 5 ? 4 leds in a series 90 85 80 75 70 5 1015202530 led current (ma) efficiency (%) l=coilcraft lpo1704-333cm v in =4.2v v in =2.7v v in =3.3v lx vin vout cs pgnd sgnd cntl comp 4.7f 0.1f 1f l 33h bat54ht1 v in 25 16 3 7 4 8 v ctrl 5 ? 5 ? 2 legs of 2 leds in a series 90 85 80 75 70 10 20 30 40 50 60 i o (ma) efficiency (%) l=coilcraft lpo1704-333cm v in =4.2v v in =2.7v lx vin vout cs pgnd sgnd cntl comp 4.7f 0.1f 1f l 33h bat54ht1 v in 25 16 3 7 4 8 v ctrl 5 ? 5 ? 2 legs of 3 leds in a series 90 85 80 75 70 10 20 30 40 50 60 i o (ma) efficiency (%) l=sumida cmd13d13-33h v in =4.2v v in =2.7v el7513
7 figure 10a. 2 legs of 4 leds in a series figure 10b. efficiency vs i o figure 10. figure 11a. 3 legs of 2 leds in a series figure 11b. efficiency vs i o figure 11. figure 12a. 3 legs of 3 leds in a series figure 12b. efficiency vs i o figure 12. typical performance curves (continued) all performance curves and waveforms are taken with c 1 = 4.7f, c 2 = 1f, c 3 = 0.1f, l = 33f, v in = 3.3v, v cntl = 1v, r 1 =5 ? , 4 leds in a series; unless otherwise specified. lx vin vout cs pgnd sgnd cntl comp 4.7f 0.1f 1f l 33h bat54ht1 v in 25 16 3 7 4 8 v ctrl 5 ? 5 ? 2 legs of 4 leds in a series 90 85 80 75 70 10 20 30 40 50 60 i o (ma) efficiency (%) l=sumida cmd13d13-33h v in =4.2v v in =2.7v lx vin vout cs pgnd sgnd cntl comp 4.7f 0.1f 1f l 15h bat54ht1 v in 25 16 3 7 4 8 v ctrl 5 ? 5 ? 5 ? 3 legs of 2 leds in a series 95 90 80 75 70 15 35 55 75 i o (ma) efficiency (%) l=sumida cmd13d13-15h v in =4.2v v in =2.7v 85 95 lx vin vout cs pgnd sgnd cntl comp 4.7f 0.1f 1f l 15h bat54ht1 v in 25 16 3 7 4 8 v ctrl 5 ? 5 ? 5 ? 3 legs of 3 leds in a series 95 90 80 75 70 15 35 55 75 i o (ma) efficiency (%) l=sumida cmd13d13-15h v in =4.2v v in =2.7v 85 95 el7513
8 figure 13a. 3 legs of 4 leds in a series figure 13b. efficiency vs i o figure 13. typical performance curves (continued) all performance curves and waveforms are taken with c 1 = 4.7f, c 2 = 1f, c 3 = 0.1f, l = 33f, v in = 3.3v, v cntl = 1v, r 1 =5 ? , 4 leds in a series; unless otherwise specified. lx vin vout cs pgnd sgnd cntl comp 4.7f 0.1f 1f l 15h bat54ht1 v in 25 16 3 7 4 8 v ctrl 5 ? 5 ? 5 ? 3 legs of 4 leds in a series 95 90 80 75 70 15 35 55 75 i o (ma) efficiency (%) l=sumida cmd13d13-15h v in =4.2v v in =2.7v 85 95 waveforms all performance curves and waveforms are taken with c 1 = 4.7f, c 2 = 1f, c 3 = 0.1f, l = 33f, v in = 3.3v, v cntl = 1v, r 1 =5 ? , 4 leds in a series; unless otherwise specified. figure 14. start-up figure 15. shut-down figure 16. transient response fig ure 17. continuous conduction mode v in i in v cntl i led 2v/div 50ma/div 1v/div 10ma/div 10ms/div c 3 =4700pf v cntl i led 50ma/div 1v/div 10ma/div i in 0.1ms/div v o v cntl i led 2v 1v 14.2v 12.9v 30ma 15ma 20ms/div i led =15ma ? v in i l v lx ? v o 10mv/div 100ma/div 10v/div 50mv/div 1s/div el7513
9 detailed description the el7513 is a constant current boost regulator specially designed for driving white leds. it can drive up to 4 leds in series or 12 leds in parallel/series configuration and achieves efficiency up to 91%. the brightness of the leds is adjusted through a voltage level on the cntl pin. when the level falls below 0.1v, the chip goes into shut-down mode and consumes less than 1a of current for v in less than 5.5v. steady-state operation el7513 is operated in constant frequency pwm. the switching is around 1mhz. depending on the input voltage, the inductance, the type of leds driven, and the led?s current, the converter operat es at either continuous conduction mode or discontinuous conduction mode (see waveforms). both are normal. brightness control led?s current is controlled by the voltage level on cntl pin (v cntl ). this voltage can be either a dc or a pwm signal with frequency less than 200hz (for c 3 =4700pf). when a higher frequency pwm is used, an rc filter is recommended before the cntl pin (see figure 20). the relationship between the led current and cntl voltage level is as follows: when r 1 is 5 ? , 1v of v cntl conveniently sets i led to 15ma. the range of v cntl is 250mv to 5.5v. shut-down when v cntl is less than 100mv, the converter is in shut- down mode. the max current consumed by the chip is less than 1a for v in less than 5.5v. over-voltage protection when an led string is disc onnected from the output, v o will continue to rise because of no current feedback. when v o reaches 18v (nominal), the ch ip will shut down. the output voltage will drop. when v o drops below 16v (nominal), the chip will boost output voltage again until it reaches 18v. this hiccough continues until led is applied or converter is shut down. when designing the converter, caution should be taken to ensure the highest operating led voltage does not exceed 17v, the minimum shut-down vo ltage. there is no external component required for this function. component selection the input and output capacitors are not very important for the converter to operate normally. the input capacitance is normally 0.22f - 4.7f and output capacitance 0.22f - 1f. higher capacitance is allowed to reduce the voltage/current ripple, but at added cost. use x5r or x7r type (for its good temperature characteristics) of ceramic capacitors with correct voltage rating and maximum height. figure 18. discontinuous conduction mode figure 19. over voltage protection (led disconnected) waveforms (continued) all performance curves and waveforms are taken with c 1 = 4.7f, c 2 = 1f, c 3 = 0.1f, l = 33f, v in = 3.3v, v cntl = 1v, r 1 =5 ? , 4 leds in a series; unless otherwise specified. v ctrl =0.34v, i led =5ma ? v in i l v lx ? v o 10mv/div 100ma/div 10v/div 50mv/div 1s/div v o (5v/div) v comp (1v/div) figure 20. pwm brightness control cntl comp pwm signal 0.1f 100k i led v cntl 13.33 r 1 ---------------------------- = el7513
10 all intersil u.s. products are manufactured, asse mbled and tested utilizing iso9000 quality systems. intersil corporation?s quality certifications ca n be viewed at www.intersil.com/design/quality intersil products are sold by description only. intersil corpor ation reserves the right to make changes in circuit design, soft ware and/or specifications at any time without notice. accordingly, the reader is cautioned to verify that data sheets are current before placing orders. information furnishe d by intersil is believed to be accurate and reliable. however, no responsibility is assumed by intersil or its subsidiaries for its use; nor for any infringements of paten ts or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of intersil or its subsidiari es. for information regarding intersil corporation and its products, see www.intersil.com when choosing an inductor, make sure the inductor can handle the average and peak currents giving by following formulas (80% efficiency assumed): where: ? ? i l is the peak-to-peak inductor current ripple in ampere ? l inductance in h ? fs switching frequency, typical 1mhz a wide range of inductance (6.8h - 68h) can be used for the converter to function correctly. for the same series of inductors, the lower inductance has lower dc resistance (dcr), which has less conducting loss. but the ripple current is bigger, which generates more rms current loss. figure 11 shows the efficiency of the demo board under different inductance for a specific series of inductor. for optimal efficiency in an application, it is a good exercise to check several adjacent inductance values of your preferred series of inductors. for the same inductance, higher overall efficiency can be obtained by using lower dcr inductor. the diode should be schottky type with minimum reverse voltage of 20v. the diode's peak current is the same as inductor's peak current, the average current is i o , and rms current is: ensure the diode's ratings exceed these current requirements. white led connections one leg of leds connected in series will ensure the uniformity of the brightness. 18v maximum voltage enables 4 leds can be placed in series. however, placing leds into series/parallel connection can give higher efficiency as shown in the efficiency curves. one of the ways to ensure the brightness uniformity is to pre- screen the leds. pcb layout considerations the layout is very important for the converter to function properly. power ground ( ) and signal ground ( ) should be separated to ensure the high pulse current in the power ground does not interference with the sensitive signals connected to signal ground. both grounds should only be connected at one point right at the chip. the heavy current paths (v in -l-l x pin-pgnd, and v in -l-d-c 2 -pgnd) should be as short as possible. the trace connected to the cs pin is most important. the current sense resister r 1 should be very close to the pin when the trace is long, use a small filter capacitor close to the cs pin. the heat of the ic is mainly dissipated through the pgnd pin. maximizing the copper area around the plane is preferable. in addition, a solid ground plane is always helpful for the emi performance. the demo board is a good example of layout based on the principle. please refer to the el7513 application brief for the layout. i lavg i o v o 0.8 v in ------------------------ = i lpk i lavg 1 2 -- - ? i l + = ? i l v in v o v in ? () lv o f s -------------------------------------------- - = efficiency vs i o v in =3.3v for different l l=coilcraft lpo1704 series 1mm height 85 83 81 79 77 5 1015202530 i o (ma) efficiency (%) l=33h l=22h l=10h l=15h figure 21. efficiency of different inductance (4 leds in a series) i drms i lavg i o = el7513
11 package outline drawing note: the package drawing shown here may not be the latest version. to check the latest revision, please refer to the intersil w ebsite at el7513
12 package outline drawing note: the package drawing shown here may not be the latest version. to check the latest revision, please refer to the intersil w ebsite at el7513

▲Up To Search▲

Price & Availability of EL7513IYZ

	To Download EL7513IYZ Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .