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1/26 www.rohm.com 2011.07 - 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) BD6590MUV description BD6590MUV 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 controlled by external pwm pulse. BD6590MUV 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) 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 6strin gs in parallel 6) input voltage range (4.5v ~ 5.5v) 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 note book pc, netpc,portable dvd player, dpf, etc. absolute maxi mum ratings (ta=25 ) parameter symbol ratings unit condition maximum applied voltage 1 vmax1 7 v vbat, iset, test, rstb, pwmdrv pwmpow, vdet, failflag, ocpset maximum applied voltage 2 vmax2 25 v led1, led2, led3, led4, led5, led6 maximum applied voltage 3 vmax3 41 v sw power dissipation 1 pd1 500 mw *1 power dissipation 2 pd2 780 mw *2 power dissipation 3 pd3 1510 mw *3 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 bee n 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/ . recommended operating range (ta=-40 ~ +85 ) parameter symbol limits unit condition min. typ. max. power supply voltage vbat 4.5 5.0 5.5 v no.11040ebt14
technical note 2/26 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6590MUV electrical characteristic (unless otherwise specified, vbat=5v, ta = +25 ) parameter symbol limits unit condition min. typ. max. quiescent current iq - 0.1 4.4 a pwmpow=pwmdrv=rstb=0v current consumption idd - 3.2 4.8 ma vdet=0v,iset=27k ? [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 - 5.5 v pull down resistor3 fsr 100 300 500 k ? [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] under voltage lock out uvlo 2.9 3.3 3.7 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 ocpset=68k ? *1 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=16ma 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 3/26 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6590MUV block diagram fig.1 BD6590MUV block diagram application example fig.2 application example (10led 6parallel) vbat vbat tsd internal power supply 5.5v clam p pwmpow internal power control uvlo internal reset fault detecto r failflag sw sw sbd open/ output short protect output over voltage protect led terminal open/short detecto r 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 8ch gnd current driver + - pwmdrv iset iset resistor driver gnd test ocpset n.c. rstb n.c. n.c. a dapter f pwm =100hz~1khz battery BD6590MUV led1 led 2 led 3 led 4 led 5 led 6 vde t 10s 6p each 16ma sw sw vbat 1 f 4.7h 10 f 4.5v to 30v pwmdrv pwmpow iset 27k ? gnd gnd pgnd test pwm 4.5v to 5.5v rstb reset failflag ocpset 68k ? 2.2f/50v 26.7k ? 1m ? vbat 10k 10k ?
technical note 4/26 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6590MUV pin vbat gnd a pin vbat pgnd b pin gnd c pin vbat gnd d pin vbat gnd e 5. 5v clump pin vbat gnd j pin vbat gnd g pin pgnd h pin pgnd i gnd pin f 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 rstb in reset j 10 iset in resister connection for led current setting a 11 gnd - gnd for switching regulator b 12 n.c. - no connect pin f 13 led1 in current sink for led c 14 led2 in current sink for led c 5 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. - 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 vbat in regulator output / internal power-supply i 23 pwmpow in pwm input pin for power on/off e 24 vbat in switching tr drive terminal i
technical note 5/26 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6590MUV description of functions 1) pwm current mode dc/dc converter while BD6590MUV is power on, the lowest voltage of led terms is detected, pwm duty is decided to be 0.7v 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 wa veform to prevent sub harmonic oscillation. 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. BD6590MUV has many safety functions, and their det ection signals stop switching operation at once. 2) soft start BD6590MUV 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, rstb 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.3 soft start fig.4 soft start reset and set 3) failflag when the error condition occurs, boost operating is stopped by th e protection function, and the error condition is outputted from failflag. after power on, when the protection 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.5 failflag operating description
technical note 6/26 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6590MUV 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.6 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 bec oming 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-activation, and current does not flow to the coil (0ma). ? thermal shut down BD6590MUV 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 7/26 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6590MUV how to set over voltage limit this section is especially mentioned here because the spec shown electrical characteristic is ne cessary 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 fo r 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 di fference 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 high between vdet and output and then set over voltage after changing resistor between vdet and gnd. while pwm is off, output voltage decreases by minimizing this resistor. d ue to the 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 fig. 7 control resistor setting vdet vout r1 r2
technical note 8/26 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6590MUV ? 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 BD6590MUV is detected peak current, current more than over current setting value does not flow. and, over current val ue can decide freely by ch anging 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, mi n = 1.4a and max = 2.6a and after the current value which was necessary for the normal operation wa s decided, detection resistor 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 BD6590MUV 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 mi n=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. 8 architecture
technical note 9/26 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6590MUV 1.5a zoom vout pwmpow coil current ocpset ? 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.9 vbat=5v, 6parallel 10serial 20ma/ch, ocpset=68k ,330pf current sence ocpset + - detect r(ocpset) 36ms
technical note 10/26 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6590MUV 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 vo ltage protection voltage. when over voltage 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 le d terminals becomes more than 25v(absolute 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.10 led open detect moreover, excessively high level of over voltage limit in te rminal 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 stri ngs which short-circuited is turned off normally and led current of other lines continue to turn on. fig.11 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 ocp 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 11/26 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6590MUV control signal input timing fig.12 control signal timing fig.13 voltag e with a control sign higher than vbat example corresponding to application of conditions in case you input control signs, such as pwmpow, and pw mdrv, in the condition that the standup of supply voltage (vbat) is not completed, be careful of the following point. input each control signal after vbat exceeds 4.1v. when you input pwmpow during the standup of vbat, please give the standup time as min.100s from 4.1v to stable voltage for vbat. there is no timing limitation at each input signal of pwmpow and pwmdrv. if each control sign changes into a condition higher than vbat in (1) and (2), it goes via the esd custody diode by the side of vbat of each terminal. a power supply is supplied to vbat and there is a possibility of malfunctioning. in order to avoid this condition, as shown in the above figure, please insert about 10k ? in a signal line, and apply current qualification. please confirm an internal pull down resistor in the block diagram and electrical property. start control (pwmpow) and select led current driver (pwmdrv) BD6590MUV 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. rstb pwmpow pwmdrv ic led current l h, l h, l off off h l l off off h h l on off h l h off off h 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 an d so on, please connect the unnecessary 2 lines open. then please set rstb,pwmpow and pwmdrv ?h? and finish selecti ng 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, this information never can be reset without setting rstb, pwmpow and pwmdrv ?l?. vbat 4.1v pwmpow min. 100 s pwmdrv vreg dc/dc vout 2 1 gnd vbat pin rin 0v 5v 10k ?
technical note 12/26 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6590MUV 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 = 432/riset (a) 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% 1) current driver pwm control is controlled by prov iding pwm signal to pwmdrv, as it is shown fig.14. the current set up with iset is chosen as the h section of pwmd rv and the current is off as the l section. therefore, the average led current is increasing in proportion to duty cycle of pwmdrv signal. this method that it lets internal circuit and dc/dc to work, because it becomes to switch the driver, the current tolera nce is a few when the pwm brightness is adjusted, so it makes it possible to brightness control until 5s (min0.1% 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~25khz. 2) power control pwm control is controlled by providing pwm si gnal to pwmpow, as it is shown fig.15. the current setting set up with pwmdrv logic is chosen as the h section and the current is off as the l secti on. therefore, the average led current is increasing in proportion to duty cycle of pwmp ow 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 brightne ss 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. 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.14 pwmdrv sequence fig.15 pwmpow sequence
technical note 13/26 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6590MUV output voltage ripple for pwm dimming conditions: 8serial 6parallel, led current=20ma/ch, vbat=5v, coil power=7v, ta=25 , output capacitor =2.2 f(50v/b3) led current rise and fall for pwm dimming conditions: 8serial 6parallel, led current=20ma/ch, vbat=5v, coil power=7v, ta=25 , output capacitor=2.2 f(50v/b3) pwm characteristics of current driver pwm pwm characteristics of power control 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 lower ripple voltage (under 200mv) pwmdrv output voltage (ac) input current 780ma 1ms/div.
technical note 14/26 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6590MUV main characteristics of efficiency conditions: 10serial 6parallel, led current=20ma/ch, output capacitor=2.2 f(50v/b3) efficiency of current driver pwm efficiency of power control pwm 50 55 60 65 70 75 80 85 90 95 100 5 1015202530 coil power [v] efficiency [%] ta=-40c ta=25c ta=85c efficiency for pwmpow control coil power=12v ta=25 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 0 102030405060708090100 pwm duty(%) efficiency efficiency vs duty (10serial x 6strings) 0.0% 10.0% 20.0% 30.0% 40.0% 50.0% 60.0% 70.0% 80.0% 90.0% 100.0% 0 102030405060708090100 pwm duty[%] efficiency[%]
technical note 15/26 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6590MUV 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 BD6590MUV 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 consumpti on, and the applied voltage exceeds ic rating 7v. that application is shown in below fig.16. the higher voltage so urce is applied to the power source of coil that is connected from 4.5v to 5.5v into ic vbat, please follow the re commend design in fig.16. 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.16 application at the time of power supply isolation (6parallel) a dapter f pwm =100hz~1khz battery BD6590MUV led1 led 2 led 3 led 4 led 5 led 6 vde t 10s 6p each 16ma sw sw vbat 1 f 4.7h 10 f 4.5v to 30v pwmdrv pwmpow iset 27k ? gnd gnd pgnd test pwm 4.5v to 5.5v rstb reset failflag ocpset 68k ? 2.2f/50v 26.7k ? 1m ? vbat 10k 10k ?
technical note 16/26 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6590MUV pcb layout in order to make the most of the performance of BD6590MUV, its pcb layout is very important. characteristics such as efficiency and ripple and the likes change greatly with layout patterns, which please note carefully. fig. 17 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 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(27k ) 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(1m ) & rvd(26.7k )> put over current limit setting resistor rvt(1m ) & rvd(26.7k ) 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 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 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. a dapter f pwm =100hz~1khz battery BD6590MUV led1 led 2 led 3 led 4 led 5 led 6 vde t 10led 6parallel each16ma sw sw vbat 1 f 4.7h 10 f 4.5v to 30v pwmdrv pwmpow iset 27k ? gnd gnd pgnd test pwm 4.5v to 5.5v rstb reset failflag ocpset 68k ? 2.2f/50v 26.7k ? 1m ? vbat 10k 10k ? cvl1 cvb1 co1 riset roc rvt rvd
technical note 17/26 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6590MUV recommended pcb layout top layer mid layer 1 mid layer 2 bottom layer fig. 18 pcb layout 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 BD6590MUV 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 b b 1 1 2.2f/10v
technical note 18/26 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6590MUV 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 4.7 h tdk ltf5022t-4r7n2r0-lc 5.0 5.2 2.2 2000 0.073 4.7 h tdk vlp6810t-4r7m1r6 6.3 6.8 1.0 1600 0.167 10 h tdk vlp6810t-100m1r1 6.3 6.8 1.0 1100 0.350 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 ? 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% [ 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 mcr03pzpzd1002 1.6 0.8 0.45 15k ? 0.5% rohm mcr03pzpzd1502 1.6 0.8 0.45 18k ? 0.5% rohm mcr03pzpzd1802 1.6 0.8 0.45 22k ? 0.5% rohm mcr03pzpzd2202 1.6 0.8 0.45 24k ? 0.5% rohm mcr03pzpzd2402 1.6 0.8 0.45 27k ? 0.5% rohm mcr03pzpzd2702 1.6 0.8 0.45 30k ? 0.5% rohm mcr03pzpzd3002 1.6 0.8 0.45 33k ? 0.5% rohm mcr03pzpzd3302 1.6 0.8 0.45 56k ? 0.5% rohm mcr03pzpzd5602 1.6 0.8 0.45 62k ? 0.5% rohm mcr03pzpzd6202 1.6 0.8 0.45 68k ? 0.5% rohm mcr03pzpzd6802 1.6 0.8 0.45 75k ? 0.5% rohm mcr03pzpzd7502 1.6 0.8 0.45 2.2m ? 0.5% rohm mcr03pzpzd2204 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 wi th small direct current resistance. 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.
technical note 19/26 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6590MUV 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 break ing mode such as a short circuit or an open circuit. if any special mode exceeding the absolute maximum ratings is assu med, 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 characte ristics 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 do wn ics. take protective m easures 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 t he gnd lines. in this regard, for the digital block power supply and the analog block power supply, even though these power supplies has the same level of potential, separate the power supply pattern for the digital block from that for t he analog block, thus suppressing the diffraction of digital noises to the analog block power supply resulting from impedance common to the wiring patterns. for the gnd line, give consideration to design the patterns in a similar manner. furthermore, for all power supply terminals to ics, mount a capacitor between the power supply and the gnd terminal. at the same time, in order to use an electrolytic capacitor, thor oughly check to be sure the characteristics of the capacitor to be used present no problem including the occurrence of capaci ty dropout at a low temperat ure, 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. (7) 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 t he ics. erroneous mounting can break down the ics. furthermore, if a short circuit occurs due to foreign matters entering between terminals or between the terminal and the power supply or t he gnd terminal, the ics can break down. (8) operation in strong electromagnetic field be noted that using ics in the strong elec tromagnetic field can malfunction them. (9) inspection with set pcb on the inspection with the set pcb, if a capacitor is connec ted to a low-impedance ic terminal, the ic can suffer stress. therefore, be sure to discharge from the set pcb by each proc ess. furthermore, in order to mount or dismount the set pcb to/from the jig for the inspection process, be sure to tu rn 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 pr ocess and pay thorough attention to the transportation and the stor age of the set pcb. (10) input terminals in terms of the construction of ic, parasitic elements are inev itably formed in relation to potential. the operation of the parasitic element can cause interference with circuit operation, thus resulting in a malfunct ion and then breakdown of the input terminal. therefore, pay thorough attention not to handle t he 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 volt age lower than the power supply voltag e or within the guaranteed value of electrical characteristics. (11) ground wiring pattern if small-signal gnd and large-current gnd are provided, it will be recommended to separate the large-current gnd pattern from the small-signal gnd pattern and establish a si ngle ground at the reference poi nt of the set pcb so that resistance to the wiring pattern and voltage fluctuations due to a large current will cause no fluc tuations in voltages of the small-signal gnd. pay attention not to cause fluctuations in the gnd wiring pattern of external parts as well. (12) external capacitor in order to use a ceramic capacitor as the external capaci tor, determine the constant with consideration given to a degradation in the nominal capacitance due to dc bias and c hanges in the capacitance due to temperature, etc. (13) 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 aim ed at isolating the lsi from thermal runa way as much as possible, is not aimed at the protection or guarantee of the lsi. therefore, do not continuous ly use the lsi with this circuit operating or use the lsi assuming its operation. (14) thermal design perform thermal design in which there ar e adequate margins by taking into account the permissible dissipation (pd) in actual states of use. (15) selection of coil select the low dcr inductors to decrease power loss for dc/dc converter.
technical note 20/26 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6590MUV 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 to function 15inch panel fig.19 10series 6parallel, led current 16ma, switching frequency 1250khz setting example power control pwm application fig.20 10series 6parallel, led current16ma, switching frequency 1250khz setting example current driver pwm application a d apt er f pwm =100hz~1khz battery BD6590MUV led1 led2 led3 led4 led5 led6 vdet 10s 6p eac h 16 ma sw sw vbat 1 f 4.7 h 10f 4.5v to 30v pwmdrv pwmpow iset 27k ? gnd gnd pgnd test pwm 4.5v to 5.5v rstb reset fa i l fl a g ocpset 68k ? 2.2f/50v 26.7k ? 1m ? vbat 10k ? 10k a d apt er f pwm =100hz ~ 25kh z battery BD6590MUV led1 led2 led3 led4 led5 led6 vdet 10s 6p eac h 16 ma sw sw vbat 1 f 4.7 h 10f 4.5v to 30v pwmdrv pwmpow iset 27k ? gnd gnd pgnd test pwm 4.5v to 5.5v rstb reset fa i l fl a g ocpset 68k ? 2.2f/50v 26.7k ? 1m ? vbat 10k ? 10k
technical note 21/26 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6590MUV 13~14inch panel 10~12inch panel fig.21 8series 6parallel, led current 16ma, switching frequency 1250khz setting example power control pwm application fig.22 8series 6parallel, led current 16ma, switching frequency 1250khz setting example current driver pwm application fig.23 7series 6parallel, led current016ma, switching frequency 1250khz setting example power control pwm application a d apt er f pwm =10 0hz~1kh z battery BD6590MUV led1 led2 led3 led4 led5 led6 vdet 8s 6p eac h 16 ma sw sw vbat 1 f 4.7 h 10f 4.5v to 26.6v pwmdrv pwmpow iset 27k ? gnd gnd pgnd test pwm 4.5v to 5.5v rstb reset fa i l fl a g ocpset 56k ? 2.2f/50v 69.8k ? 2. 2m ? vbat 10k ? 10 k a d apt er f pw m =100hz~1khz battery BD6590MUV led1 led2 led3 led4 led5 led6 vdet 8s 6p ea ch 16 ma sw sw vbat 1 f 4.7 h 10f 4.5v to 26.6v pwmdrv pwmpow iset 27k ? gnd gnd pgnd test pwm 4.5v to 5.5v rstb reset fa i l fl a g ocpset 52.2k ? 2.2f/50v 69.8k ? 2. 2m ? vbat 10k ? 10k a d apt er f pwm =100hz~1khz battery BD6590MUV led1 led2 led3 led4 led5 led6 vdet 7s 6p each 16ma sw sw vbat 1 f 4.7 h 10f 4.5v to 23.9v pwmdrv pwmpow iset 27k ? gnd gnd pgnd test pwm 4.5v to 5.5v rstb reset fa i l fl a g ocpset 47k ? 2.2f/50v 78.7k ? 2. 2m ? vbat 10k ? 10 k led 7
technical note 22/26 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6590MUV 7inch panel fig.24 8series 3parallel, led current 16ma, switching frequency 1250khz setting example power control pwm application fig.25 6series 4parallel, led current 16ma, switching frequency 1250khz setting example power control pwm application fig.26 8series 3parallel, led current 40.2ma, switching frequency 1250khz setting example power control pwm application a d apt er f pwm =100hz~1khz battery BD6590MUV led1 led2 led3 led4 led5 led6 vdet 6s 4p eac h 16 ma sw sw vbat 1 f 4.7 h 10f 4.5v to 21.2v pwmdrv pwmpow iset 27k ? gnd gnd pgnd test pwm 4.5v to 5.5v rstb reset fa i l fl a g ocpset 68k ? 2.2f/50v 69.8k ? 2. 2m ? vbat 10k 10k ? 10k a d apt er f pwm =100hz~1khz battery BD6590MUV led1 led2 led3 led4 led5 led6 vdet 8s 3p eac h 40 .2 ma sw sw vbat 1 f 4.7 h 10f 4.5v to 26.6v pwmdrv pwmpow iset 21.5k ? gnd gnd pgnd test pwm 4.5v to 5.5v rstb reset fa i l fl a g ocpset 56k ? 2.2f/50v 69.8k ? 2. 2m ? vbat 10k 10k ? 10k a d apt er f pwm =100hz~1khz battery BD6590MUV led1 led2 led3 led4 led5 led6 vdet 8s 3p eac h 16 ma sw sw vbat 1 f 4.7 h 10f 4.5v to 26.6v pwmdrv pwmpow iset 27k ? gnd gnd pgnd test pwm 4.5v to 5.5v rstb reset fa i l fl a g ocpset 68k ? 2.2f/50v 69.8k ? 2. 2m ? vbat 10k 10k ? 10k
technical note 23/26 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6590MUV 5inch panel fig.27 8series 2parallel, led current16ma, switching frequency1250khz setting example power control pwm application fig.28 8series 2parallel, led current 40.2ma, switching frequency 1250khz setting example power control pwm application fig.29 8series 2parallel, led current 88.8ma, switching frequency 1250khz setting example power control pwm application adapter f pwm =100hz~1khz battery BD6590MUV led1 led 2 led 3 led 4 led 5 led 6 vde t 8s 2p each 16ma sw sw vbat 1 f 4.7h 10 f 4.5v to 26.6v pwmdrv pwmpow iset 27k ? gnd gnd pgnd test pwm 4.5v to 5.5v rstb reset failflag ocpset 33k ? 2.2f/50v 69.8k ? 2.2m ? vbat 10k 10k ? 10k adapter f pwm =100hz~1khz battery BD6590MUV led1 led 2 led 3 led 4 led 5 led 6 vde t 8s 2p each 40.2ma sw sw vbat 1 f 4.7h 10 f 4.5v to 26.6v pwmdrv pwmpow iset 21.5k ? gnd gnd pgnd test pwm 4.5v to 5.5v rstb reset failflag ocpset 68k ? 2.2f/50v 69.8k ? 2.2m ? vbat 10k 10k ? 10k adapter f pwm =100hz~1khz battery BD6590MUV led1 led 2 led 3 led 4 led 5 led 6 vde t 8s 2p each 88.8ma sw sw vbat 1 f 4.7h 10 f 4.5v to 26.6v pwmdrv pwmpow iset 27k ? gnd gnd pgnd test pwm 4.5v to 5.5v rstb reset failflag ocpset 68k ? 2.2f/50v 69.8k ? 2.2m ? vbat 10k 10k ? 10k
technical note 24/26 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6590MUV fig.30 3series 5parallel, led current 16ma, switching frequency 1250khz setting example power control pwm application fig.32 3series 6parallel, led current 177.6ma, switching frequency 1250khz setting example power control pwm application fig.33 10series 1parallel, led current177.6ma, switching frequency 1250khz setting example power control pwm application fig.31 3series 6parallel, led current 29.6ma, switching frequency 1250khz setting example power control pwm application a d apt er f pwm =100hz~1khz battery BD6590MUV led1 led2 led3 led4 led5 led6 vdet 3s 5p eac h 16 ma sw sw vbat 1 f 4.7 h 10f 4.5v to 13v pwmdrv pwmpow iset 27k ? gnd gnd pgnd test pwm 4.5v to 5.5v rstb reset fa i l fl a g ocpset 33k ? 2.2f/50v 187k ? 2. 2m ? vbat 10k ? 10k a d apt er f pwm =100hz~1khz battery BD6590MUV led1 led2 led3 led4 led5 led6 vdet 3s 6p eac h 29 .6 ma sw sw vbat 1 f 4.7 h 10f 4.5v to 13v pwmdrv pwmpow iset 14.6k ? gnd gnd pgnd test pwm 4.5v to 5.5v rstb reset fa i l fl a g ocpset 47k ? 2.2f/50v 187k ? 2. 2m ? vbat 10k ? 10k a d apt er f pwm =100hz~1khz battery BD6590MUV led1 led2 led3 led4 led5 led6 vdet 3s 6p each 177.6ma sw sw vbat 1 f 4.7 h 10f 4.5v to 13v pwmdrv pwmpow iset 14.7k ? gnd gnd pgnd test pwm 4.5v to 5.5v rstb reset fa i l fl a g ocpset 47k ? 2.2f/50v 187k ? 2. 2m ? vbat 10k ? 10k a d apt er f pwm =100hz~1khz battery BD6590MUV led1 led2 led3 led4 led5 led6 vdet 10s 1p each 177.6ma sw sw vbat 1 f 4.7 h 10f 4.5v to 30v pwmdrv pwmpow iset 14.7k ? gnd gnd pgnd test pwm 4.5v to 5.5v rstb reset fa i l fl a g ocpset 68k ? 2.2f/50v 26.7k ? 1m ? vbat 10k ? 10k
technical note 25/26 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6590MUV 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.34 BD6590MUV analog style optical application pwmdrv pw mpow rstb f pwm =100hz~ 1khz test ocpset 68 k BD6590MUV 2.2 f / 50 v 4.7 h 10 f 4.5v t o 30 v 1 f coil power 10l ed 6p a r a l l e l failflag sw sw vb at vb at vdet led1 led2 led3 led4 led5 led6 pgnd gnd gnd iset 2.2m 62 k pwm 4.5v t o 5.5 v battery or adapter reset 470 k 22k d/a pwmdrv pw mpow rstb f pwm =100hz~ 1khz test ocpset 68 k BD6590MUV 2.2 f / 50 v 4.7 h 10 f 4.5v t o 30 v 1 f coil power 10l ed 6p a r a l l e l failflag sw sw vb at vb at vdet led1 led2 led3 led4 led5 led6 pgnd gnd gnd iset 2.2m 62 k pwm 4.5v t o 5.5 v battery or adapter reset 470 k 22k d/a
technical note 26/26 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD6590MUV ordering part number b d 6 5 9 0 m u v - e 2 part no. part no. 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 0.4 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 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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