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product structure silicon monolithic integrated circuit this product is not designed prot ection against radioactive rays 1/30 tsz02201-0g3g0c400340-1-2 03.dec.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 14 ? 001 datashee t BD6142AMUV ch 1 ch 2 ch 3 ch 4 ch 5 ch 6 ch 7 ch 8 ov p 10 serial x 8 parallel (80pcs) 20ma abc lx lx 2.2 f/50v fau lt vin 10h 10f enab le pwm 2.1v to vin co mp 1k ? iset 36k ? gnd pgnd pwm f pw m =100hz~25khz vdc pgnd 22n f 2.2m ? 68k ? vout 2.2f gnd pgnd fset test 56k ? 1nf 7v to 27v reset 8-channel white led driver with integrated fet for up to 80 leds BD6142AMUV general description this ic is white led driver ic with pwm step-up dc/dc converter that can boost max 41v and current driver that can drive max 30ma. the wide and precision brightness can be controlled by external pwm pulse. this ic 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 panel. small package is suited for saving space. features ? high accuracy & good matching current drivers 8ch (max30ma/ch) ? integrated 50v power nch mosfet ? soft start function ? drive up to 11 leds in series, 8 strings in parallel ? rich safety functions ? over-voltage protection ? external sbd open detect / output short protection ? over current limit ? ch terminal open / gnd short protect ? ch over voltage protect / led short protect ? thermal shutdown ? uvlo ? analog brightness control typical application circuit (8 parallel) key specifications ? operating power supply voltage range: 4.2v to 27.0v ? led maximum current: 30ma (max.) ? quiescent current: 1.6 a (typ.) ? switching frequency: 1.25mhz(typ.) ? operating temperature range: -40 to +85 package w(typ.) x d (typ.) x h(max.) vqfn024v4040 4.00mm x 4.00mm x 1.00mm applications all medium sized lcd equipments, backlight of notebook pc, net book, monitor, light, portable dvd player, light source etc. figure 2. typical application circuit figure 1. package vqfn024v4040 downloaded from: http:///
2/30 BD6142AMUV datasheet tsz02201-0g3g0c400340-1-2 03.dec.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 absolute maximum ratings (ta=25 ) parameter symbol ratings unit condition terminal voltage 1 vmax1 7 v vdc, iset, abc, comp, fset, test, fault terminal voltage 2 vmax2 45 v ch1 to ch8, lx, ovp terminal voltage 3 vmax3 30.5 v vin, enable terminal voltage 4 vmax4 15 v pwm power dissipation 1 pd1 500 *1 mw power dissipation 2 pd2 780 *2 mw power dissipation 3 pd3 1510 *3 mw operating temperature r ange topr -40 to +85 storage temperature range tstg -55 to+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 its used by more than ta=25 , its reduced by 6.2mw/ . *3 4 layer (jedec compliant board) has been mounted. copper foil area 1layer 6.28mm 2 , copper foil area 2 to 4layers 5655.04mm 2 , when its used by more than ta=25 , its reduced by 12.1mw/ . recommended operating rating (ta=-40 to +85 ) parameter symbol limits unit conditions min. typ. max. power supply voltage vin 4.2 12.0 27.0 v electrical characteristics (unless otherwise specified, vin=12v, ta = +25 ) parameter symbol limits unit conditions min. typ. max. [general] quiescent current iq - 1.6 4.4 a enable=0v current consumption idd - 3.6 5.4 ma ovp=0v,iset=36k ? max. output voltage mov - - 41 v under voltage lock out uvlo 3. 1 3.7 4.1 v vin falling edge [enable terminal] low input voltage range enl 0.0 - 0.8 v high input voltage range1 enh 2.0 - vin v pull down resistor enr 100 300 500 k ? enable=3v output current eniout - 0 2 a enable=0v [pwm terminal] low input voltage range pwml 0.0 - 0.8 v high input voltage range2 pwmh 1.3 - 12.0 v pull down resistor pwmr 100 300 500 k ? pwm=3v output current pwmiout - 0 2 a pwm=0v [fault] nch ron ffcr - - 3 k ? enable =pwm=3v, ovp=2v [regulator] vdc voltage vreg 4.2 5.0 6.0 v no load, vin > 6v downloaded from: http:///
3/30 BD6142AMUV datasheet tsz02201-0g3g0c400340-1-2 03.dec.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 electrical characteristics C continued (unless otherwise specified, vin=12v, ta = +25 ) parameter symbol limits unit conditions min. typ. max. [switching regulator] led control voltage vled 0.64 0.80 0.96 v switching frequency accuracy fs w 1.00 1.25 1.50 mhz fset=56k ? duty cycle limit duty 91.0 95.0 99.0 % ch1-8=0.3v, fset=56k ? lx nch fet ron ron - 0.48 0.58 ? ilx=80ma [protection] over current limit ocp 1.5 2.5 - a *1 over voltage limit input ovp 1.16 1.20 1.24 v detect voltage of ovp output short protect ovpfault 0.02 0. 05 0.08 v detect voltage of ovp ovp leak current ovil - 0.1 1.0 a ch terminal over voltage protect accuracy vsc -15 0 +15 % vsc=5v [current driver] led maximum current ilmax - - 30 ma led current accuracy ila ccu - - 2.5 % iled=20ma (36k ? ) led current matching ilmat - - 2.5 % (max led current C min led current)/ ideal current (20ma) iled=20ma led current matching2 ilmat2 - - 1.5 % ? each led current/average (ch1- 8) ? iled=20ma led current limiter ilocp - 0 0.1 ma current limit value at iset resistance 1k ? setting iset voltage iset - 0.733 - v led current accuracy2 ilaccu2 - 3.0 - % iled=20ma, abc=0.733v *1 this parameter is tested with dc measurement. downloaded from: http:///
4/30 BD6142AMUV datasheet tsz02201-0g3g0c400340-1-2 03.dec.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 pin vdc gnd a pin vin pgnd b pin gnd c pin vin gnd d pin gnd e 5.5v clump pin pgnd f pin pgnd g gnd pin descriptions pin esd type pin no. pin name io function terminal diagram 1 enable in pwm input pin for power on/off or power control e 2 test in test signal (pull down 100k ? within ic) e 3 fset in resister connection for frequency setting a 4 abc in analog brightness control c 5 gnd - gnd for switching regulator b 6 pwm in pwm input pin for power on/off only driver e 7 ch8 in current sink for ch8 c 8 ch7 in current sink for ch7 c 9 ch6 in current sink for ch6 c 10 ch5 in current sink for ch5 c 11 iset in resister connection for led current setting a 12 ch4 in current sink for ch4 c 13 ch3 in current sink for ch3 c 14 ch2 in current sink for ch2 c 15 ch1 in current sink for ch1 c 16 ovp in detect input for sbd open and ovp c 17 pgnd - pgnd for switching tr d 18 19 lx out switching tr drive terminal f 20 out switching tr drive terminal f 21 fault out fault signal c 22 comp out erramp output a 23 vin in battery input g 24 vdc out regulator output / internal power-supply c - thermal pad - heat radiation pad of back side connect to gnd figure 3. pin esd type downloaded from: http:///
5/30 BD6142AMUV datasheet tsz02201-0g3g0c400340-1-2 03.dec.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 block diagram pin number 24pin figure 4. block diagram enable lx lx pgnd pgnd vin vdc reg tsd internal powe r supply clam p internal power control uvlo internal reset faul t detecto r fault output short protect output over voltage protect led terminal open/short detector led return select ch1 ch 2 ch 3 ch 4 ch 5 ch 6 ch 7 ch 8 ovp + - current sense over current protect soft start control sense osc + erramp pwm co mp 8ch gnd current driver + - pwm iset iset resistor driver comp test fset abc clamp downloaded from: http:///
6/30 BD6142AMUV datasheet tsz02201-0g3g0c400340-1-2 03.dec.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 typical performance curves ta = 2 5 iset = 36k ? ch1 = 0.8v 10serial 8parallel ta = 2 5 led current = 20ma pwm frequency = 200hz frequency = 1.25mhz (fset=56k ? ) coil = 10h figure 5. led current characteristics pwm dimming 10 serial 8parallel ta = 2 5 led current = 20ma pwm frequency = 30khz frequency = 1.25mhz(fset=56k ? ) coil = 4.7h figure 6. led current characteristics pwm dimming led current [ ma ] led current [ ma ] figure 7. led current characteristics analog dimming figure 8. led maximum current vin = 12v ch1 = 0.8v downloaded from: http:///
7/30 BD6142AMUV datasheet tsz02201-0g3g0c400340-1-2 03.dec.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 application example figure 11, figure 12 and figure 13 are application examples (15.4inch and 12inch and 10.1inch model). recommended schematics and layout are shown in p22. figure 11. BD6142AMUV application example (8 parallel) ta = 2 5 10 serial 8parallel led current = 20ma coil = tdk, ltf5022t-100m1r4-lc figure 9. efficiency ta = 2 5 10 serial 6parallel led current = 20ma coil = tdk, ltf5022t-100m1r4-lc figure 10. efficiency BD6142AMUV ch1 ch2 ch3 ch4 ch5 ch6 ch7 ch8 ovp 10 serial x 8 parallel (80pcs) 20ma abc lx lx 2.2f/50v fault vin 10h 10f enable pw m 2.1v to vin comp 1k ? iset 36k ? gnd pgnd pw m f pw m =100hz~25khz vdc pgnd 22nf 2.2m ? 68k ? vout 2.2f gnd pgnd fset test 56k ? 1nf 7v to 27v reset downloaded from: http:///
8/30 BD6142AMUV datasheet tsz02201-0g3g0c400340-1-2 03.dec.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 figure 12. BD6142AMUV application example (6 parallel) figure 13. BD6142AMUV application example (3 parallel) BD6142AMUV ch 1 ch 2 ch 3 ch 4 ch 5 ch 6 ch 7 ch 8 ov p 10 serial x 3 parallel (30pcs) 20ma abc lx lx 2.2 f/50v fault vin 10h 10f 4.2v to 27v enab le reset pwm 2.1v to vin co mp 1k ? iset 36k ? gnd pgnd pwm f pw m =100hz~25khz vdc pgnd 22nf 2.2m ? 68k ? vout 2. 2 f gnd pgnd fset test 11 0 k ? 1nf BD6142AMUV ch1 ch2 ch 3 ch 4 ch 5 ch 6 ch 7 ch 8 ov p 9 serial x 6 parallel (54pcs) 20ma abc lx lx 2.2 f/50v fault vin 10h 10f 7v to 27v enab le reset pwm 2.1v to vin co mp 1k ? iset 36k ? gnd pgnd pw m f pw m =100hz~25khz vdc pgnd 22nf 2.2m ? 73.2k ? vout 2. 2 f gnd pgnd fset test 56k ? 1nf downloaded from: http:///
9/30 BD6142AMUV datasheet tsz02201-0g3g0c400340-1-2 03.dec.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 functional descriptions 1) pwm current mode dc/dc converter while this ic is power on, the lowest vo ltage of ch1, 2, 3, 4, 5, 6, 7, 8 is detected, pwm duty is decided to be 0.8v and output voltage is kept invariably. as for the inputs of the pwm comparator 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 s ub harmonic oscillation. this output controls internal nch tr via the rs latch. in the period where inte rnal 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) pulse skips control this ic regulates the output voltage using an improved pulse-skip. in pulse-ski p mode the error amplifier disables switching of the power stages when it detects low outp ut voltage and high input voltage. the oscillator halts and the controller skip switching cycles. the error amplifier reactivate s the oscillator and starts switching of the power stages again when this ic detects low input voltage. at light loads a conventional pulse-skip regulation mode is used. the pulse- skip regulation minimizes the operating current because this ic does not switch continuously and h ence the losses of the switchi ng are reduced. when the error amplifier disables switching, the load is also isolated from the input. this improved pulse-skip control is also referred t o as active-cycle control. figure 14. pulse-skip 3) 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 enable, pwm is changed l ? h, and uvlo is detected, so ft start becomes effective for within typ 4.3ms and soft start doesn't become effective even if enable is changed l ? h after that. figure 15. soft start 4) fault when the error condition occurs, boost operating is stopped by the protection function, and t he error condition is outputted from fault. after power on, when the protection functi on is operating under about 4.3ms(typ.) have passed. once enable change to l, fault status is reset object of protect function is as shown below. - over-voltage protection (ovp) - thermal shut down (otp) - over current limit (ocp) - output short protect - led short (latch) - led open (latch) figure 16. fault operating description off normal boost stop normal off normal un-detection detect un-detect typ4.3 ms faul t protection function(ovp, tsd, ocp) boost operating vdc pwm x x h l h l h mask un-detect protection function(led open, led short) detect un-detect latch typ100 s enable pwm vout led current lx 20ma duty 20% @1.25mhz(typ) pulse skip pwm uvl o enable max 1ms typ 4.3ms off on off on vdc soft star t enable max 1ms off on off on vdc soft start pwm uvl o off t1 t2 s oft star t time=t1+t2=4.3ms typ. downloaded from: http:///
10/30 BD6142AMUV datasheet tsz02201-0g3g0c400340-1-2 03.dec.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 protection protection table case failure mode detection mode fail channel good channel vout regulated by fault terminal 1 led short connected ch1 ch1 > vsc(5v) led current stop and dc/dc feedback doesnt return ch2 to ch8normal highest vf of ch2 to ch8 h ? l (latch) 2 led open connected ch1 ch1 < 0.2v and vout > vovp led current stop and dc/dc feedback doesnt return ch2 to ch8normal highest vf of ch2 to ch8 h ? l (latch) 3 vout/lx gnd short ovp < 50mv fault change from l to h, and switching is stopped. when ovp>50mv, fault return l - h ? l 4 output led stack voltage too high vout > vovp fault change from l to h, and switching is stopped. even if ovp<1.2v, fault dont return l - h ? l 5 lx current too high ocp > 2.5a or otp > 130 ? c fault change from l to h, and switching is stopped. even if ic return normal status, fault dont return l - h ? l ? over voltage protection (ovp) at such an error of output op en as the output dc/dc and the led is not c onnected to ic, the dc/dc will boost too much and the ovp terminal exceed the absolute maximum ratings, and may destruct the ic. therefore, when ovp terminal becomes sensing voltage or higher, the over voltage limit pr otection works, and turns off t he switching tr, and dc/dc will be stopped. at this moment, the ic changes from activation into non-ac tivation, and the output voltage goes down slowly. and, when the feedback of ch1 isnt returned, so t hat vout will return normal voltage. figure 17. ovp operating description vout ch1 volta g e ch1 connection ch2 connection feedbac k enable, pwm connec t ch1 ch1 ch2 connect open ch1 curren t 20m a 0m a ch2 curren t 20m a 0m a ovp signal hysteresis(typ 2.5%) downloaded from: http:///
11/30 BD6142AMUV datasheet tsz02201-0g3g0c400340-1-2 03.dec.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 this section is especially mentioned here because the spec sh own electrical characteristic is necessary to explain this section. over voltage limit min 1.16v typ 1.20v max 1.24v led control voltage min 0.64v typ 0.80v max 0.96v led terminal over voltage protect min 4.25v typ 5.00 v max 5.75v 1. calculate the conditions that the 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. (0.96v) example) the biggest value of output = 28v + 0.96v =28.96v 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 = 28.96v, the smallest value of over voltage = 28.96v x 1.06 = 30.70v ic over voltage limit min=1.16v, typ=1.20v, max=1.24v typ = 30.70v (1.20v/1.16v) = 31.76v max = 31.76v (1.26v/1.20v) = 33.35v 4. the below shows how to control resistor setting over voltage please fix resistor high between ovp te rminal and output and then set over voltage after changing resistor between ovp terminal and gnd. while pwm is off, output voltage decreas es by minimizing this resistor. due to the decrease of output voltage, ripple of output voltage increases, and singing of output condenser also becomes bigger. example) selecting ovp resistor. ? ovp resistor selection (example. 1) vf=3.5v max, serial = 7 led ovp = 1.2v, r1 = 2.2m ? , r2 = 95.3k ? vout = 1.2 (2.2m ? + 95.3k ? )/ 95.3k ? = 28.90v (example. 2) vf=3.5v max, serial = 8 led ovp = 1.2v, r1 = 2.2m ? , r2 = 82k ? vout = 1.2 (2.2m ? + 82k ? )/ 82k ? = 33.40v (example. 3) vf=3.5v max, serial = 9 led ovp = 1.2v, r1 = 2.2m ? , r2 = 73.2k ? vout = 1.2 (2.2m ? + 73.2k ? )/ 73.2k ? = 37.27v (example. 4) vf=3.5v max, serial = 10 led ovp = 1.2v, r1 = 2.2m ? , r2 = 68k ? vout = 1.2 (2.2m ? + 68k ? )/ 68k ? = 40.02v ? 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 internal tr may be destructed. therefore, at such an error as ovp becoming 50mv(typ.) or below, turns off the output tr, and prevents the coil and the ic from being destructed. and the ic changes from activation into non-activation, 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 130 ? c (typ.) or higher, and the ic changes from activation into non-activation. ovp terminal vout r1 r2 downloaded from: http:///
12/30 BD6142AMUV datasheet tsz02201-0g3g0c400340-1-2 03.dec.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 operating of the application deficiency 1)when 1 led or 1string open during the operating the led string which became open isn't lighting, but other led strings are lighting. then led terminal is 0voutput boosts up to the over voltage pr otection voltage. when over voltage is detected, the feedback of open string isnt returned, so that vout will return normal voltage. 2)when led short-circuited in the plural all led strings is turned on unless ch1 to 8 terminal voltage is more than 5v(typ.). when it was more than 5v only the st rings which short-circuited is turn ed off normally and led current of other lines continue to turn on. short line(ch1) current is chang ed from 20ma to 0.05ma(typ.), so ch1 terminal dont heat. 3)when schottky diode remove all led strings arent turned on. also, ic and a switching tr ansistor aren't destroyed because boost operating stops by the schottky diode open protected function. ch 1 ch 2 ch 1 ch 2 figure 18. led open protect figure 19. led short protect vout ch1 voltage ch1 connection ch2 connection feedback enable, pwm ch1 curren t connect ch1 off ch2 connect o p en 20ma 0ma ch2 curren t 20ma 0ma ch1 ovp ch1 enable 100 s ch1terminal feedback ch1 current ch1 ch2 ch2 current 20ma 20ma 0.05ma(typ.) vout 0.8v led short ch2 terminal 0.8v typ 5v ch1>c 100 s( typ.) downloaded from: http:///
13/30 BD6142AMUV datasheet tsz02201-0g3g0c400340-1-2 03.dec.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 control signal input timing timing sequence1 referring to figure 20, the recommended turn on sequence is vin followed by enable and pwm. the recommended turn off sequence is enable and pwm followed by vin. this sequence is recommendation. timing sequence2 referring to figure 21, the recommended turn on sequence is vin, enable followed by pwm. the recommended turn off sequence is followed enable and vin by pwm. enable, pwm vin power on power off led ic timing sequence for pwm control turn-on vin 2 to 5v min 0 s pwm enable min 0 s 4.2 to 27v 2 to 5v 0 to 0.8v 0 to 0.8v 0v led ic timing sequence for pwm control turn-off pw m 2 to 5v min 0 s vin enable min 0 s 4.2 to 27v 2 to 5v 0 to 0.8v 0 to 0.8v 0v figure 20. timing sequence1 pwm vin, enable power on power off enable 2 to 5v min 0 s vin pwm min 0 s 4.2 to 27v 2 to 5v 0 to 0.8v 0 to 0.8v 0 v vin 2 to 5v min 0 s enable pwm min 0 s 4.2 to 27v 2 to 5v 0 to 0.8v 0 to 0.8v 0v led ic timing sequence for pwm control turn-on figure 21. timing sequence2 led ic timing sequence for pwm control turn-off *other signal is input after a signal turned on. *other signal is input after a signal turned off. *other signal is input after a signal turned off. *other signal is input after a signal turned on. downloaded from: http:///
14/30 BD6142AMUV datasheet tsz02201-0g3g0c400340-1-2 03.dec.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 timing sequence3 referring to figure 22, the recommended turn on sequence is vin, pwm followed by enable. the recommended turn off sequence is followed enable and vin by pwm. vin wake up speed figure 23. control signal timing in case, there is pwm off status (min: 10ms) during operation as figure 24, enable should turn from h to l as figure 24. if pwm stops and vout voltage is dropped, this ic will be conditi on of current limiter when pwm starts (no soft start). if soft start isnt needed, reset is no need. vin min. 100s 4.1 v 1 2 figure 24. pwm stop and enable turn off pwm off vin enable min 10ms reset pwm pwm enable vin, pwm power on power off pwm 2 to 5v min 0 s vin enable min 0 s 4.2 to 27v 2 to 5v 0 to 0.8v 0 to 0.8v 0 v vin 2 to 5v min 0 s pwm enable min 0 s 4.2 to 27v 2 to 5v 0 to 0.8v 0 to 0.8v 0v led ic timing sequence for pwm control turn-on figure 22. timing sequence3 led ic timing sequence for pwm control turn-off *other signal is input after a signal turned on. *other signal is input after a signal turned off. downloaded from: http:///
15/30 BD6142AMUV datasheet tsz02201-0g3g0c400340-1-2 03.dec.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 how to activate please be careful about the following when being activated. - regulator (vdc) operates after enable=h. inside circui t operates after releasing uvlo. when ic boosts after releasing uvlo, soft start function operates. (ref er to figure 15, 9p). soft start circuit needs t 15 (more than 15s) as figure 25. shows. soft start operates for t soft time. please make h width of pwm more than 15s until soft start finishes. - please input pwm signal according to figure 26. after soft start finishes. figure 25. soft start example) time until soft start finishes at pwm frequency 25khz and pwm=h time16s according to soft start time typ4.3ms t soft = 16s C 15s = 1s soft start time/ t soft /pwm frequency = 4300s / 1s /25khz = 4300 / 25khz = 172ms figure 26. input timing (after soft start) name unit min. typ. max. t1 power supply rising time s 100 - - t2 power supply-enable time s 0 - - t3 enable rising time s 0 - 100 t4 enable falling time s 0 - 100 t5 enable low width s 50 - - t6 power supply-pwm time s 0 - - t7 pwm rising time s 0 - 100 t8 pwm high width s 5 - - t9 pwm falling time s 0 - 100 t10 pwm low width s 5 - - t11 pwm frequency s 40 5000 10000 t12 enable (h)->pwm (h) time s 0 - - t13 enable (l)->pwm (l) time s 0 - - t14 pwm (l)->enable (l) time s 0 - - t15 pwm high width (while soft start) s 15 - - h operating voltage v 4.2 12 27 l non operating voltage v - - 4.2 l[v] [] [] a t light dimming of pwm terminal (after soft start finishes) c al ica.. downloaded from: http:///
16/30 BD6142AMUV datasheet tsz02201-0g3g0c400340-1-2 03.dec.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 how to select the number of led strings of the current driver when the number of led strings of the current driver is reduc ed, the un-select can be set the matter that the unnecessary ch1 to 8 terminal is opened. when it uses with 6 lines and so on, it can correspond to it by becoming 2 unnecessary lines to open. when vout wake up, vout boost up until ovp voltage. once ic detect ovp, vout dont boost up until ovp from next start up. to set pwm and enable to l, ic reset ch7, 8 status as figure 27. when vout wake up, ch8 (open terminal) and ch1 are selected as figure 28. figure 27. select the number of ch lines 1 figure 28. select the number of ch lines 2 (wake up) ch 1 ch 2 ch 3 ch 4 ch 5 ch 7 ch 6 ch 8 pwm enabl e vout ch1 to 6 ch7 to 8 ov p normal volta g e 0.8v(typ.) 0v 0v reset mask open ch1 curren t ch8 terminal ch8 curren t 20ma vo u t soft start: typ 4.3ms enable stable pwm ch1 terminal 0ma 0ma feedback terminal typ 0.8v over voltage protect signal unmask ter m in al s el e c t ( led open protect ) ch1 ch 8 normal condition o ver voltage protect 10 0 s(ty p .) downloaded from: http:///
17/30 BD6142AMUV datasheet tsz02201-0g3g0c400340-1-2 03.dec.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 start control (enable) and select led current driver (pwm) this ic can control the ic system by enable, and ic can power off compulsory by setting 0.8v or below. also, it powers on enable is at more than 2.0v. after its selected to enable=h, when it is selected at pwm=h, led current decided with iset resistance flow. next, when it is selected at pwm=l, led current stop to flow. enable pwm ic led current 0 0 off off 1 0 on off 0 1 off off 1 1 on current decided with iset led current setting range led current can set up normal current by resistance value (riset) connecting to iset voltage. setting of each led current is given as shown below. riset = 720/iledmax also, normal current setting range is 10ma to 30ma. led cu rrent becomes a leak current max 2a at off setting. iset normal current setting example riset led current 24k ? (e24) 30.0ma 30k ? (e24) 24.0ma 36k ? (e24) 20.0ma 43k ? (e24) 16.7ma 68k ? (e12) 10.6ma frequency setting range switching frequency can be set up by resistance value (rfset) connecting to fset port. setting of frequency is given as shown below. also, frequency setting range is 0.60mhz to 1.60mhz. fset frequency setting example rfset frequency 130k ? (e96) 0.57mhz 56k ? (e24) 1.25mhz 43k ? (e24) 1.59mhz max duty example frequency max duty[%] min typ max 0.57mhz - 96.0 - 1.25mhz 91.0 95.0 99.0 1.59mhz - 92.0 - min duty example frequency min duty[%] min typ max 1.25mhz - 20 - frequency [mhz] 1.25 56k ? 130 k ? fset[k ? ] 0.57 1.59 43 k ? downloaded from: http:///
18/30 BD6142AMUV datasheet tsz02201-0g3g0c400340-1-2 03.dec.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 pwm dimming current driver pwm control is controlled by providing pwm signal to pwm port, as it is show in figure 29. the current set up with iset is chosen as the h section of pwm and the current is off as the l section. therefore, the average led current is increasing in proportion to duty cycle of pwm 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, it makes it possible to brightness control until 5s (min 0.1% at 200hz). and, don't use for the brightness control, because effect of iset changeover is big under 1s on time and under 1s off time. typical pwm frequency is 100hz to 25khz. conditions 8serial 6parallel, led current=20ma/ch, vin=7v, ta=25 , output capacitor=2.2 f(50v/b3) analog dimming BD6142AMUV control led current according analog input (abc terminal). for abc voltage = typ 0.733v, led current can set up normal current by resistance value (riset) connecting to iset voltage. to decrease abc voltage, led current decrease, and to increase abc voltage, led current increase. please set max led current to check led current setting range of p.17 please care that abc voltage of max led current is 0.733v abc input range is 0.05v to 0.9v(target). this dimming is effected by iset tolerance as follows. when you dont use analog dimming, please set condenser to abc terminal. until the condenser of abc terminal is finished to charge, led current increase with that speed. the resister between 1.2v and abc terminal is 120.9k ? . please select the capacitor to care charge time. pwm led current coil current ics active current on off on off on off on figure 29. pwm sequence iset + - iset resistor driver abc 1.2v 0.733v dc input 120.9k ? 36k ? 180k iset + - iset resistor driver abc 1.2v 0.733v 120.9k ? 180k ? 36k ? figure 30. analog dimming application figure 31. pwm dimming application iled [ma] 20ma 0.733 v 0.9v abc[v] figure 32. iled vs abc voltage pwm vout led current vout pwm 400ns/div 10ma/div led current 40ns/div 10ma/div downloaded from: http:///
19/30 BD6142AMUV datasheet tsz02201-0g3g0c400340-1-2 03.dec.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 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. please select lower dc resistance (dcr) type, efficiency still relies on the dcr of inductor. please estimate peak current of coil. peak current can be calculated as following. peak current calculation 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 = v in - inductance value of coil = l - switching frequency = fsw (min=1.0mhz, typ = 1.25mhz, max = 1.5mhz) - output voltage = vout - total led current = i led - average current of coil = iave - peak current of coil = ipeak - cycle of switching = t - efficiency = eff (please set up having margin) - on time of switching transistor = ton - on duty = d ccm: ipeak = (v in / l) (1 / fsw) (1-( v in / vout)), dcm: ipeak = (v in / l) ton iave=( vout iout / v in ) / eff ton=(iave (1- v in / vout) (1/fsw) (l/ v in ) 2) 1/2 each current is calculated. as peak current varies according to whether there is the direct current superposed, the next is decided. ccm: (1- v in / vout) (1/fsw) < ton ? peak current = ipeak /2 + iave dcm: (1- v in / vout) (1/fsw) > ton ? peak current = v in / l ton (example 1) in case of, v in = 7.0v, l = 10h, fsw = 1.2mhz, vout = 32v, i led = 120ma, efficiency = 88% iave = (32 120m / 7) / 88% = 0.62a ton = (0.62 (1 - 7 / 32) (1 / 1.2m) (10 / 7) 2) 1/2 = 1.07s (1- v in / vout) (1 / fsw) = 0.65s < ton(1.07s) ccm ipeak = (7 / 10) (1 / 1.2m) (1 - (7 / 32)) = 0.46a peak current = 0.46a / 2 + 0.62a = 0.85a (example 2) in case of, v in = 16.0v, l = 10h, fsw = 1.2mhz, vout = 32v, i led = 120ma, efficiency = 88% iave = (32 120m / 16.0) / 88% = 0.27a ton = (0.27 (1-16 / 32) (1 / 1.2m) (10 / 16) 2) 1/2 = 0.37s (1- v in / vout) (1 / fsw)=0.41s > ton(0.37s) dcm ipeak = v in / l x ton = 16 / 10 x 0.37s = 0.59a peak current = 0.59a *when too large current is set, output overshoot is caused, be ca reful enough because it is led to break down of the ic in case of the worst. dcm/ccm calculation discontinuous condition mode (dcm) and continuous condition mode (ccm) are calculated as following. ccm: l > vout d (1 - d) 2 t / (2 i led ) dcm: l < vout d (1 - d) 2 t / (2 i led ) *d = 1- v in / vout (example 1) in case of, v in = 7.0v, l = 10h, fsw = 1.2mhz, vout = 32v, i led = 120ma vout d (1 - d) 2 t / (2 i led ) = 32 (1 C 7 / 32) (7 / 32) 2 1/(1.2 10 6 ) / (2 0.12) = 4.15 < l(10h) ? ccm (example 2) in case of, v in = 12.0v, l = 10h, fsw = 1.2mhz, vout = 32v, i led = 60ma vout d (1 - d) 2 t / (2 i led ) = 32 (1 C 12 / 32) (12 / 32) 2 1/(1.2 10 6 ) / (2 0.06) = 19.5 > l(10h) ? dcm downloaded from: http:///
20/30 BD6142AMUV datasheet tsz02201-0g3g0c400340-1-2 03.dec.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 output capacitor selection output capacitor smoothly keeps output voltage and supplies led current. output voltage consists of charge (fet on) and discharge (led current). so output voltage has output ripple voltage every fet switching. output ripple voltage is calculated as following. output ripple voltage - switching cycle = t - total led current = i led - switching on duty = d - output ripple voltage = v ripple - output capacitor = cout - output capacitor (real value) = c real - decreasing ratio of capacitor = c error c real = cout c error (capacitor value is decreased by bias, so) c real = i led d t / v ripple cout = i led d t / v ripple / c error (example 1) in case of, v in =12.0v, fsw = 1.2mhz, vout =32v, i led =120ma, cout = 8.8f, c error = 50% t = 1 / 1.2mhz d = 1 C v in / vout = 1 C 12/32 v ripple = i led d t / (coutc error ) = 120ma (1-12/32) / 1.2mhz / (8.8f0.5) = 14.2mv 0v 35v 50v output voltage capa [f] cout c real figure 33. bias characteristics of capacitor downloaded from: http:///
21/30 BD6142AMUV datasheet tsz02201-0g3g0c400340-1-2 03.dec.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 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 27v. that application is shown in below figure 34. the higher voltage source is applied to the power source of coil that is connected from an adapter etc. next, the ic power supply is connected with a different coil power supply. under the conditions for inputting from 4.2v to 5.5v into ic vin, please follow the recommend design in figure 34. it connects vin terminal and vdc terminal together at icoutside. 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. and, ther e is no power on-off sequence of coil power supply and ic power supply. separate vin and coil power supply connect vin and vdc terminals figure 34. application at the time of power supply isolation BD6142AMUV ch1 ch 2 ch 3 ch 4 ch 5 ch 6 ch 7 ch 8 ovp 10 serial x 6 parallel (60pcs) 20ma abc lx lx 2.2f/50v fa ult vin 10h 10f 7v to 27v enable reset pwm 2.1v to vin co mp 1k ? iset 36k ? gnd pgnd pwm f pw m =100hz~25khz vdc pgnd 22 n f 2. 2m ? 68k ? vout 2.2f gnd pgnd fset 4.2v to 30v test 1nf 56 k ? BD6142AMUV ch1 ch2 ch3 ch4 ch5 ch6 ch7 ch8 ov p 10 serial x 6 parallel (60pcs ) 20ma abc lx lx 2.2f/50v fault vin 10h 10f 4.2v to 5.5v enable reset pwm 2.1v to vin comp 1k ? iset 36k ? gnd pgnd pwm f pwm =100hz~25khz vdc pgnd 22n f 2.2m ? 68k ? vout 2.2f gnd pgnd fset 4.2v to 30v test 56k ? 1nf downloaded from: http:///
22/30 BD6142AMUV datasheet tsz02201-0g3g0c400340-1-2 03.dec.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 layout in order to make the most of the performance of this ic, its pcb layout is very important. characteristics such as efficiency and ripple and the likes change greatly with layout patterns, which please note carefully. figure 35. schematic put input bypath capacitor cin (10 f) as close as possible between coill1 and pgnd pin. connect smoothing capacitor cvdc1(2.2 f) as close as possible between vdc pin and gnd. connect schottky barrier diode sbd as close as possible between coil1and lx pin. connect output capacitor cout1 between cathode of sbd and pgnd. make both pgnd sides of cvin and cout1 as close as possible. > connect led current setting resistor riset(36k ? ) as close as possible between iset pin and gnd. there is possibility to oscillate when capacity is adde d to iset terminal, so pay attention that capacity isnt added. put analog dimming pin smoothing capacitor cabc (1nf) close to abc pin and do not extend the wiring to prevent noise increasing and also led current waving. put frequency setting resistor(56k ? ) as close as possible between fset pin and gnd. put gmamp setting resistor rcmp(1k ? ) and ccmp(22nf) as close as possible to comp pin and do not extend the wiring to prevent noise increasing and also oscillating. gnd is analog ground, and pgnd is power ground. pgnd might cause a lot of noise due to the coil current of pgnd. try to connect with analog ground, after smoothing with input bypath capacitor cvin and output capacitor cout 1. pad is used for improving the efficiency of ic heat radiation. 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 connected directly near the chip, influence is give to the performance of BD6142AMUV, 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. BD6142AMUV ch1 ch 2 ch 3 ch 4 ch 5 ch 6 ch 7 ch 8 ov p 10 serial x 8 parallel (80pcs) 20ma abc lx lx cout1(2.2f/50v) fault vin l1(10h) cin(10f) 7v to 27v enab le reset pwm 2.1v to vi n co mp rcmp(1k ? ) ise t ris et(36k ? ) gnd pgnd pwm f pwm =100hz~25khz vdc pgnd ccmp(22nf) ro vp 1 (2.2m ? ) ro vp 2 (68k ? ) vout cv dc1 (2.2f) gnd pgnd fset test sbd rfset(56k ? ) c abc(1nf ) downloaded from: http:///
23/30 BD6142AMUV datasheet tsz02201-0g3g0c400340-1-2 03.dec.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 recommended pcb layout figure 36. top copper trace layer figure 37. middle1 copper trace layer figure 38. middle2 copper trace layer figure 39. bottom copper trace layer cout1 sbd pgnd gnd riset rovp2 rovp1 rcmp ccmp l1 cin cvdc1 d6142 gnd pgnd input voltage vout rfset cabc downloaded from: http:///
24/30 BD6142AMUV datasheet tsz02201-0g3g0c400340-1-2 03.dec.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 selection of external parts recommended external parts are as shown below. when to use other parts than these, select the following equivalent parts. ? coil value manufacturer product number size (mm) dc current (ma) dcr ( ? ) l w h (max) 4.7 h tdk ltf5022t-4r7n2r0-lc 5.0 5.2 2.2 2000 0.073 4.7 h toko a915ay-4r7m 5.2 5.2 3.0 1870 0.045 10h toko a915ay-100m 5.2 5.2 3.0 1400 0.140 10h tdk ltf5022t-100m1r4-lc 5.0 5.2 2.2 1400 0.140 10h toko b1047as-100m 7.6 7.6 5.0 2700 0.053 ? capacitor value pressure manufacturer product number size l w h 10f 25v murata grm31cb31e106ka75 3.2 1.6 1.6 4.7 f 25v murata grm319r61e475k 3.2 1.6 0.850.1 2.2 f 50v tdk c3225jb1h225k 3.2 2.5 2.00.2 2.2f 50v murata grm31cb31h225k 3.2 1.6 1.6 2.2f 50v panasonic ecjhvb1h225k 3.2 1.6 0.85 2.2f 10v murata grm188b31a225k 1.6 0.8 0.8 0.1f 50v murata grm188b31h104k 1.6 0.8 0.8 0.1f 10v murata grm188b31a104k 1.6 0.8 0.8 0.022f 10v murata grm155b31h223k 1.0 0.5 0.5 470pf 50v murata grm155b11h471k 1.0 0.5 0.5 ? resistor value tolerance manufacturer product number size (mm) l w h 2.2m ? 1.0% rohm mcr03pzpzfx2204 1.6 0.8 0.45 91k ? 0.5% rohm mcr03pzpzd9102 1.6 0.8 0.45 75k ? 0.5% rohm mcr03pzpzd7502 1.6 0.8 0.45 68k ? 0.5% rohm mcr03pzpzd6802 1.6 0.8 0.45 56k ? 0.5% rohm mcr03pzpzd5602 1.6 0.8 0.45 36k ? 0.5% rohm mcr03pzpzd3602 1.6 0.8 0.45 10k ? 1.0% rohm mcr03pzpzf103 1.6 0.8 0.45 1k ? 0.5% rohm mcr03pzpzd1002 1.6 0.8 0.45 330 ? 0.5% rohm mcr03pzpzd3300 1.6 0.8 0.45 ? sbd pressure manufacturer product number size (mm) l w h 60v rohm rb160m-60 3.5 1.6 0.8 the coil is the part that is most influential to efficiency. select the coil whose direct current resistor (dcr) and current - inductance characteristic is excellent. BD6142AMUV is des igned for the inductance value of 10h. dont use the inductance value less than 3.3h. select a capacitor of ceramic type with excellent frequency and temperature characteristics. further, select capacitor to be used with small direct current resistance. about heat loss in heat design, operate the dc/dc converter in the following condition. (the following temperature is a guarantee temperature, so consider the margin.) 1. ambient temperature ta must be less than 85 . 2. the loss of ic must be less than dissipation pd. downloaded from: http:///
25/30 BD6142AMUV datasheet tsz02201-0g3g0c400340-1-2 03.dec.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 application example 1. esd & flicker (wakeup (duty 5%@200hz)) led current: 20ma (iset = 36k ? ) led: 10 leds in series, 3 strings in parallel figure 40. application example of 10inch panel d6142 c c a a p p a a 4 4 7 7 0 0 p p f f r r e e s s i i s s t t o o r r 2 2 0 0 ? ? i i c c c c a a p p a a 1 1 f f figure 41. layout example for esd protection BD6142AMUV ch 1 ch 2 ch 3 ch 4 ch 5 ch 6 ch 7 ch 8 ov p 10 serial x 3 parallel (30pcs) 20ma abc lx lx 2.2 f/50v fault vin 10h 10f 4.2v to 27v enab le reset pwm 2 . 1v to vin co mp 1k ? iset 36k ? gnd pgnd pwm f pw m =1 00 hz~2 5khz vdc pgnd 22nf 560k ? 18k ? vout 2. 2 f gnd pgnd fset test 56k ? 1nf 470p f 470p f 470pf 1uf 20 ? for esd protection 0.1uf downloaded from: http:///
26/30 BD6142AMUV datasheet tsz02201-0g3g0c400340-1-2 03.dec.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 2. analog dimming and monitoring fault terminal led current: 20ma (iset = 36k ? ) led: 10 leds in series, 8 strings in parallel figure 42. application example of analog dimming 3. application example of ch terminal connected led current: 20ma (iset = 36k ? ) led: 3leds 12 strings figure 43. application example of ch terminal connected BD6142AMUV ch 1 ch 2 ch 3 ch 4 ch 5 ch 6 ch 7 ch 8 ov p 10 serial x 8 parallel (80pcs) 20 m a abc lx lx 2.2f/50v fa ult vin 10h 10 f 7v to 27v enab le reset pwm 2.1v to vin co mp 1k ? is et 36k ? gnd pgnd vdc pgnd 22n f 2.2m ? 68k ? vout 2.2f gnd pgnd fset test 3v to 5v monitor d/a max 0.9v 30 k ? 1nf 56k ? BD6142AMUV ch 1 ch 2 ch 3 ch 4 ch 5 ch 6 ch 7 ch 8 ov p 3 serial x 12parallel (36pcs) 30 m a abc lx lx 2.2f/50v fa ult vin 10h 10f 5v enab le reset pwm 2.1v to vin co mp 1k ? iset 24k ? gnd pgnd vdc pgnd 22n f 2. 2 m ? 160k ? vout 2.2f gnd pgnd fset test 3v to 5v monitor 30 k ? 1nf 56k ? pwm downloaded from: http:///
27/30 BD6142AMUV datasheet tsz02201-0g3g0c400340-1-2 03.dec.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 operational notes (1) absolute maximum 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 approximately 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 mounting an external diode between the power supply and th e ics 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 the 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 capaci tor, thoroughly check to be sure the characteristics of the capacitor to be used present no problem including the occu rrence 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 electromagnetic field can malfunction them. (8) inspection with set pcb on the inspection with the set pcb, if a capacitor is connected 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 dismount it from the jig. in addition, for protection against static electricity, establish a ground for the assembly process and pay thorough attention to the transportation and the 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 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 voltage 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 point of the set pcb so that resistance to the wiring pattern and voltage fluctuations due to a large current will cause no fluctuations in voltages of the small-signal gnd. pay attention not to cause fluctuations in the gnd wiring pattern of external parts as well. downloaded from: http:///
28/30 BD6142AMUV datasheet tsz02201-0g3g0c400340-1-2 03.dec.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 (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 changes in the capacitance due to temperature, etc. (12) thermal shutdown circuit (tsd) when junction temperatures become 130 (typ.) or higher, the thermal shutdown circuit operates and turns a switch off. the thermal shutdown circuit, which is aimed at isolat ing the lsi from thermal runaway as much as possible, is not aimed at the protection or guarantee of the lsi. therefor e, do not continuously 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. status of this document the japanese version of this document is formal specification. a customer may use this translation version only for a reference to help reading the formal version. if there are any differences in translation version of this document formal version takes priority. downloaded from: http:///
29/30 BD6142AMUV datasheet tsz02201-0g3g0c400340-1-2 03.dec.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 ordering information b d 6 1 4 2 a m u v - e2 part number package muv: vqfn024v4040 packaging and forming specification e2: embossed tape and reel marking diagram physical dimension tape and reel information (unit : mm) vqfn024v4040 0.08 s s 16 7 12 19 24 13 18 0.4 0.1 0.02 +0.03 - 0.02 1pin mark 2.4 0.1 c0.2 0.5 4.0 0.1 0.75 2.4 0.1 4.0 0.1 1.0max (0.22) 0.25 +0.05 - 0.04 ? order quantity needs to be multiple of the minimum quantity. embossed carrier tape tapequantity 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 vqfn024v4040 (top view) 1pin mark part number marking lot number d6142 downloaded from: http:///
30/30 BD6142AMUV datasheet tsz02201-0g3g0c400340-1-2 03.dec.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 revision history date revision changes 03.dec.2012 001 new release downloaded from: http:///
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, 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 any ro hms 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 rohms 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 below), 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 described 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 downloaded from: http:///
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 considering 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 humidity 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 rohms 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 contained 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. downloaded from: http:///
datasheet datasheet notice C 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. downloaded from: http:///

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