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1/29 www.rohm.com 2011.01 - rev.c ? 2011 rohm co., ltd. all rights reserved. led drivers for lcd backlights white backlight led drivers for small to medium lcd panels (switching regulator type) bd6067gu, bd6069gut, bd 6071hfn, bd6072hfn description switching regulator type led driver series for small lcd backl ight are boost dc/dc converters possible to drive the white leds at constant. it is possible that tu rning on white led steadily by a series c onnection which has no current variation, and by a fast transient response with current mode. and, bd 6069gut/BD6071HFN/bd6072hfn are white led driver ics with synchronous rectification. with synchronous rectification (no external schottky diode required) and small package, they can save mount space. BD6071HFN suited over voltag e and over current limit from bd6069gut/bd6072hfn. features 1) boost dc/dc converter 2) adjustment of brightness by external pwm pulse 3) possible to driving 3 leds (BD6071HFN ) 4) possible to driving 4 leds (bd6069gut, bd6072hfn) 5) possible to driving 8 leds (bd6067gu) 6) soft start function (bd6067g u, bd6069gut, BD6071HFN, bd6072hfn) 7) synchronous rectification boost dc/dc converter (bd6069gut, BD6071HFN, bd6072hfn) 8) no external schottky diode required (bd6069gut, BD6071HFN, bd6072hfn) 9) output open ? short protect (bd6069gut, BD6071HFN, bd6072hfn) applications these drivers are applicable for various fields such as mobile phones, portable game machines, inter-phone camera, audio player, portable dvd player, back light for printer displa y etc? and support light of the camera for the mobile phone, simple flash. and, these can use power supply for oel. line up matrix parameter input voltage range switching frequency white led number operating temperature range package bd6067gu 2.7 ~ 5.5v 0.8 ~ 1. 2mhz 5 ~ 8 -30 ~ +85 vcsp85h1 bd6069gut 2.7 ~ 5.5v 0. 8 ~ 1.2mhz 4 -30 ~ +85 vcsp60n1 BD6071HFN 2.7 ~ 5.5v 0. 8 ~ 1.2mhz 3 -30 ~ +85 hson8 bd6072hfn 2.7 ~ 5.5v 0. 8 ~ 1.2mhz 4 -30 ~ +85 hson8 no.11040ect19
technical note 2/29 www.rohm.com 2011.01 - rev.c ? 2011 rohm co., ltd. all rights reserved. bd6067gu, bd6069gut, bd 6071hfn, bd6072hfn ? bd6067gu absolute maximum ratings (ta=25 ) parameter symbol ratings unit conditions power supply voltage 1 vmax1 7 *1 v applicable to vin, en, vfb and vdac pins power supply voltage 2 vmax2 40 *1 v applicable to sw and vout pins operating temperature range topr -30 ~ +85 storage temperature range tstg -55 ~ +150 power dissipation pd 800 *2 mw 50mm58mm1.75mm glass epoxy pcb mounting *1 this value is based on gnd. *2 this loss decreases approximate 6.4mw/ when ta is 25 or more. recommended operation range (ta=-30 to +85 ) parameter symbol ratings unit conditions operating supply voltage vcc 2.7 ~ 5.5 v vin pin electrical characteristics (unless otherwise stated, ta is 25 and vin is 3.6v.) parameter symbol limits unit conditions min. min. min. ?l? level input voltage vthl - - 0.4 v ?h level input voltage vthh 1.4 - - v ?h? level input current iih - 18.3 30.0 a en=5.5v ?l? level input current iil -2.0 -0.1 - a en=0v vdac-vfb resistance v dar 56 112 168 k ? input voltage range vin 3.1 - 5.5 v quiescent current iq - 0.1 2.0 a en=0v operating current idd - 0.9 1.4 ma en=3.6v, vfb=1.0v vfb pin control voltage vfb 0.18 0.20 0.22 v over current limit icoil 450 600 750 ma *1 sw transistor on resistance ronn - 0.5 1.4 ? isw=200ma switching frequency fsw 0.8 1.0 1.2 mhz maximum duty duty 92.5 95.0 - % vfb=0v output voltage range vo - - 30.0 v over voltage protection ov p 30.0 31.0 32.0 v vfb=0v output open protection ovl - 0.7 1.4 v startup time ts - 0.5 1.0 ms vout=24v *1 the dc current is measured in this item.
technical note 3/29 www.rohm.com 2011.01 - rev.c ? 2011 rohm co., ltd. all rights reserved. bd6067gu, bd6069gut, bd 6071hfn, bd6072hfn ? bd6067gu electrical characteristic curves (reference data) fig.1 operating current vs. power supply voltage fig.2 quiescent current vs. power supply voltage fig.3 oscillation frequency vs. power supply voltage fig.5 efficiency vs. led current (7led) (ta=25 ) fig.6 efficiency vs. led current (8led) (ta=25 ) fig.7 output voltage vs. power supply voltage (8led) fig.8 vfb pin control voltage vs. power supply voltage (8led) (iled=20ma) fig.9 en pin pwm brightness control characteristic (f=100hz, ta=25 ) fig.4 efficiency vs. led current (6led) (ta=25 ) fig.10 dac brightness control characteristic 0.0 1.0 2.0 3.0 4.0 5.0 2.533.5 44.555.5 vin [v] idd [ma] ta =25 ta =-3 0 ta =85 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 2.533.5 44.555.5 vin [v] iq [a] ta =25 ta =-3 0 ta =85 50 60 70 80 90 100 5 15253545 iled [ma] efficiency [%] vin=3.6v vin=5.5v vin=3.1v 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 2.53 3.544.5 55.5 vin [v] switching fr eqency [mhz] ta =25 ta =-3 0 ta =85 50 60 70 80 90 100 5 15253545 iled [ma] efficiency [%] vin=3.6v vin=3.1v vin=5.5v 50 60 70 80 90 100 5 15253545 iled [ma] efficiency [%] vin=3.6v vin=3.1v vin=5.5v 0 500 1000 1500 2000 2500 3000 3500 2.53 3.544.5 55.5 vin [v] output power [m w ] ta =25 ta =-3 0 ta =85 170 180 190 200 210 220 230 2.533.5 44.555.5 vin [v] vfb [mv] ta =25 ta =-3 0 ta =85 0 5 10 15 20 25 0 2040 6080100 en duty [%] iled [ma] vin=2.7v vin=3.1v vin=3.6v 0 5 10 15 20 25 0.0 0.5 1.0 1.5 2.0 vdac [v] iled [ma] vin=3.6v vin=2.7v vin=3.1v
technical note 4/29 www.rohm.com 2011.01 - rev.c ? 2011 rohm co., ltd. all rights reserved. bd6067gu, bd6069gut, bd 6071hfn, bd6072hfn ? bd6067gu block diagram and recommended circuit example fig.11 block diagram and recommended circuit example fig.12 pin location diagram vcsp85h1 (bottom view) pin assignment table pin number pin name in/out function a1 gnda - analog gnd a2 en in enable control (pull-down by internal resistance) a3 vdac in analog signal input for current adjustment b1 vin - supply voltage input b3 vfb in feedback voltage input c1 vout in over voltage protection input sbd open protection input c2 sw in switching pin c3 gnd - power gnd + + - osc control + - s q r tsd - + sw en gnd 300k ? - + pwmcomp erramp vout vfb vin gnda thermal shutdown 14k ? vdac 98k ? c urrent sence l1 22 h cin 1f r1 10 ? cout 1f output open protect over voltage protect vin d1 off on q1 20ma c1 b1 a1 a2 a3 b3 c3 c2
technical note 5/29 www.rohm.com 2011.01 - rev.c ? 2011 rohm co., ltd. all rights reserved. bd6067gu, bd6069gut, bd 6071hfn, bd6072hfn ? bd6067gu release circuit protection 1) operation bd6067gu is a constant frequency pwm current mode dc/dc converter. it is shown in the block diagram of fig.11. in a pwm comparator forming one of the pwm current mode featur es, one is an error element from the error amplifier and another is an element produced by superimposing the inductor current on a slope waveform that prevents sub-harmonic oscillation. this output controls q1 via the rs latch. energy is stored in an external inductor whileq1 is on and then it is moved to the cout capacitor via d1 while q1 is off. in this way, voltage vout higher than input voltage vin can be obtained. because the above operation is perf ormed in a way that the vfb pin volt age equals the vfb vo ltage, the boost voltage is dominantly determined by the expression ?vf number of leds.? vout voltage = (vf number of leds) + vfb 2) led current control the led current is determined depending on the vfb pi n voltage ?vfb? and the resistance connected to vfb. i led is given below. i led =200mv/ r1 i led [ma] bd6067gu r1 [ ? ] 5 39 10 20 12 16 15 13 20 10 3) dimming control ? control by pwm signal the startup condition of bd6067gu is c ontrolled via the shdnb/en pin. it is po wered off at 0.4v or less and powered on at 1.4v or more. as shown in fig.13, brightness is controlled in the bd6067gu via the pwm si gnal input the shdnb/en pin. in this way, the led current is controlled in a range from 0 to the maximum current. the average led current increases in proportion to the duty cycle of the pwm signal. in the pwm of f cycle, no current dissipation takes place in ic and leds, resulting in high efficiency. duties below 5% and abov e 95% must no be used for brightness control because they significantly affects the leading and trailing edges. bd 6067gu standard pwm frequency ranges from 100hz to 300hz. fig.13 example of brightness cont rol by pwm signal at the en pin pwm 100hz~300hz vin sw en gnd vfb l1 22 h 1 f r1 10 ? vin i led gnda vout bd6067gu vdac d1
technical note 6/29 www.rohm.com 2011.01 - rev.c ? 2011 rohm co., ltd. all rights reserved. bd6067gu, bd6069gut, bd 6071hfn, bd6072hfn ? bd6067gu ? control by dc voltage bd067gu has a built-in function for led current control by dc voltage and can control the current by vdac pin control voltage. over voltage protection bd6067gu has an over voltage protection f eature. when a fault occurs, for exampl e, ic is disconnected from led, an excessive voltage rise may cause the sw pin and vout pin to exceed the absolute maximum ratings respectively, resulting in ic damage. for this reason, when vout is 30v or more, over voltage protection is ac tivated to turn q1 off so that the sw pin and vout pin don?t exceed the absolute maximum ratings. at this time, the ic state changes from active to inactive and the output voltage drops slowly . then, when the output voltage falls below the over voltage protection hysteresis level, the output voltage continues to rise up to 30v again. this protection circuit is shown in fig.16. fig.16 block diagram for short-circuit pr otection and over voltage protection 1 f r1 10 ? dac vin sw en gnd vfb gnda vout bd6067gu vdac l1 22 vout over detector control over voltage ref driver sw cout d1 q1 fig.15 dac constant current characteristics by dac control 0 5 10 15 20 25 0 0.5 1 1.5 2 2.5 dac [v] (vfb=200mv) iled [ma]
technical note 7/29 www.rohm.com 2011.01 - rev.c ? 2011 rohm co., ltd. all rights reserved. bd6067gu, bd6069gut, bd 6071hfn, bd6072hfn ? bd6067gu startup and rush current bd6067gu has a built-in soft start function. this function prevents the rush current from being generated at startup time. fig.17 soft start circuit application circuit example the output maximum voltage range of bd6067gu is 30v. *** when led has 8 lights, special care should be taken to prevent output voltage (vout) from exceeding 30v. vout = (led vf number of led lights) + vfb fig.18 example of dimming circuit subj ect to pwm control at the vdac pin + + - osc control + - s q r tsd - + sw gnd 300k ? - + pwmcomp erramp vout v fb vin gnda th erma l shutdown 14k ? vdac 98k ? c urrent sence r1 10 ? 1f 1khz r2 10k ? cout 1f en output open protect over voltage protect d1 l1 22 h cin 1 f vin off on q1 i led tsd - + sw - + vout vin th erma l shutdown cout 1f output open protect over voltage protect d1 l1 22h cin 1 f vin + + - osc control + - s q r en gnd 300k ? pwmcomp erramp vfb gnda 14k ? vdac 98k ? c urrent sence r1 10 ? vdac 0 ~ 1.8v off on - soft start circuit q1 i led
technical note 8/29 www.rohm.com 2011.01 - rev.c ? 2011 rohm co., ltd. all rights reserved. bd6067gu, bd6069gut, bd 6071hfn, bd6072hfn ? bd6067gu external components selection method <> r1: determines the led current i led at power on. i led (ma) r1[ ? ] 5 39 15 13 20 10 l1: coil for boost. the recommended value is 22h. be sure to use a sufficient dc current permissible value and a sufficient low dc resistance coil. inductance value model number/manufacturer 22h nr3015t220m / taiyo yuden cin: power supplie bypass capacitor. this capacitor must be provided to remove an instantaneous power supply noise for stable voltage supply to this ic. to obtain good characterist ics, the low esr parts like the ceramics capacitor must be used. the recommended capacitance is 1f or more. capacitance value model number/manufacturer 1.0f grm188b11a105ka61b / murata c0: output smoothing capacitor. the capacitance recommended for bd6067gu is 1.0f. capacitance value model number/manufacturer 1.0f umk107c105ka-b / taiyo yuden when selecting capacitors for cin and c0, special care should be taken for rated voltage. the desirable rated voltage is about double the voltage actually applied to the capacitor. when the margin for rated voltage is not sufficient, the capacitance may be a half or less of the nominal value. d1: schottky barrier diode (sbd) for output rectification. to ac hieve high conversion efficiency, use a diode characterized by of low vf, low reverse leak and high current capacity. model number/manufacturer rb160m-40 / rohm recommended pcb layout when a pcb designed, the power supply line should be wir ed in a way that the board im pedance can be minimized. if necessary, the bypass capacitor must be connected. in particul ar, pins around the dc/dc converter must be wired in such a way that the wiring impedance can be minimized. in addition, wh en a dc/dc converter using a coil is used, it is necessary to place the output capacitor cout, coil l1, rectification diode d1 and bypass capa citor cin near this ic and keep the gnd impedance low. fig.19 pcb layout image gnda en vdac vin vfb vout sw gnd cin cout to battery gnd r 1 to cell voltage source l1 d 1
technical note 9/29 www.rohm.com 2011.01 - rev.c ? 2011 rohm co., ltd. all rights reserved. bd6067gu, bd6069gut, bd 6071hfn, bd6072hfn ? bd6067gu top surface (top view) bottom surface (top view) fig. 20 pcb layout ***bypass capacitor and gnd it is necessary to place bypass capacitor cin, coil l1 and power ground gnd near this ic (cin2 of fig.20). to obtain good characteristics, as t he need arises power supply, bypass capacitor cin between analog gnda must be added. (at led8 lights). when led has 8 lights, full assessment is required for characteristics prior to usage.
technical note 10/29 www.rohm.com 2011.01 - rev.c ? 2011 rohm co., ltd. all rights reserved. bd6067gu, bd6069gut, bd 6071hfn, bd6072hfn ? BD6071HFN absolute maximum ratings (ta=25 ) parameter symbol ratings unit conditions power supply voltage 1 vmax1 7 * 1 v applicable to vin,en,vfb, test pins power supply voltage 2 vmax2 20 * 1 v applicable to sw,vout pins power dissipation pd 630 * 2 mw 70mm70mm1.6mm at glass epoxy board mounting operating temperature range topr -30 ~ +85 storage temperature rang tstg -55 ~ +150 *1 these values are based on gnd and gnda pins. *2 when it?s used by more than ta=25 , it?s reduced by 5.04mw/ . recommended operating range (ta=-30 ~+85 ) parameter symbol ratings unit conditions min. typ. max. operating supply voltage vin 2.7 3.6 5.5 v electrical characteristic (unless otherwise specified ta = +25 , vin=3.6v) parameter symbol limits unit conditions min. typ. max. en threshold voltage (low) vthl - - 0.4 v en threshold voltage (high) vthh 1.4 - - v en terminal input current iin - 18.3 30.0 a en=5.5v en terminal output current iout -2.0 -0.1 - a en=0 input voltage range vin 3.1 - 5.5 v quiescent current iq - 0.1 2.0 a en=0v current consumption idd - 1.1 1.5 ma en=2.6v,vfb=1.0v,vin=3.6v feedback voltage vfb 0.47 0.50 0.53 v inductor current limit icoil 200 265 330 ma vin=3.6v *1 sw saturation voltage vsat - 0.14 0.28 v isw=200ma, vout=13v sw on resistance p ronp - 2.1 3.2 ? ipch=200ma,vout=13v switching frequency fsw 0.8 1.0 1.2 mhz duty cycle limit duty 82.7 85.0 - % vfb=0v output voltage range vo - - 14.0 v over voltage limit ovl 14.0 14.5 15.0 v vfb=0v start up time ts - 0.5 1.0 ms *1 this parameter is tested with dc measurement. electrical characteristic curves (reference data) fig.21 current consumption vs. power source voltage fig.22 quiescent current vs. power source voltage fig.23 oscillation frequency vs. power source voltage 0.0 1.0 2.0 3.0 4.0 5.0 2.533.5 44.555.5 vin [v] iin [ma] ta =25 ta =-3 0 ta =85 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 2.533.5 44.555.5 vin [v] iin [a] ta=-30, 25, 85 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 2.53 3.544.5 55.5 vin [v] switching fr eqency [mhz] ta =25 ta =-3 0 ta =85
technical note 11/29 www.rohm.com 2011.01 - rev.c ? 2011 rohm co., ltd. all rights reserved. bd6067gu, bd6069gut, bd 6071hfn, bd6072hfn ? BD6071HFN electrical characteristic curves (reference data) ( 4ms/div ) iin 200ma/div iled 20ma/div vout 5v/div en 2v/div fig.31 soft start ( vin = 3.6v, ta = 25 , 3led, 20ma load ) fig.32 led open output voltage fig.33 led luminance adjustment ( vin = 3.6v, ta = 25 , 3led, 20ma load ) fig.26 efficiency vs. led current < 2led > (vout=7.5v, ta=25 ) fig.25 efficiency vs. led current in each coil < 3led > (vout=10.5v, vin=3.6v, ta=25 ) fig.24 efficiency vs. led current in each coil < 2led > (vout=7.5v, vin=3.6v, ta=25 ) fig.27 efficiency vs. led current < 3led > (vout=10.5v, vin=3.6v, ta=25 ) fig.29 output power vs. power source voltage fig.28 inductor current limits vs. temperature fig.30 feedback voltage vs. power source voltage ( 100s/div ) iin 100ma/dev vout 10v/div vfb 0.5v/div en 5v/div 10ms a ve iin =1.5ma S v=1.57v ( 4ms/div ) iin 200ma/div vout 1v/div 60 65 70 75 80 85 90 10 15 20 25 30 35 40 iled [ma] efficiency [%] coilcraft : do1608c-223 tdk:vlcf4020t-220mr56 murata:lqh32cn220k53 tdk:vlf3012at-220mr33 60 65 70 75 80 85 90 10 15 20 25 30 35 40 iled [ma] efficiency [%] coilcraft : do1608c-223 tdk:vlcf4020t-220mr56 murata:lqh32cn220k53 tdk:vlf3012at-220mr33 60 65 70 75 80 85 90 10 15 20 25 30 35 40 iled [ma] efficiency [%] vin=5.5v vin=3.1v vin=4.5v vin=3.6v 200 220 240 260 280 300 320 340 -30 - 10 10 30 50 70 90 tempar ature [ ] iin [ma] vin=5.5v vin=3.1v vin=3.6v 60 65 70 75 80 85 90 10 15 20 25 30 35 40 iled [ma] efficiency [%] vin=5.5v vin=3.1v vin=4.5v vin=3.6v 0 500 1000 1500 2000 2.5 3 3.5 4 4.5 vin [v] output power [mw ] ta =85 ta =25 ta =-3 0 0.47 0.48 0.49 0.5 0.51 0.52 0.53 2.53 3.544.5 55.5 vin [v] vfb [v] ta =85 ta =25 ta =-3 0
technical note 12/29 www.rohm.com 2011.01 - rev.c ? 2011 rohm co., ltd. all rights reserved. bd6067gu, bd6069gut, bd 6071hfn, bd6072hfn ? BD6071HFN block diagram, recommended circuit example, pin location diagram fig.34 block diagram and recommended circuit diagram fig.35 pin location diagram hson8 (top view) pin assignment table pin name in/out pin number function gnda - 1 analog gnd en in 2 enable control(pull down is integrated on resistance) test in 3 test input (pull down is integrated on resistance) vin in 8 power supply input vfb in 4 feedback input voltage vout out 7 output sw in 6 switching terminal gnd - 5 power gnd operation BD6071HFN is a fixed frequency pwm current mode dc/dc conver ter, and adopts synchronous rectification architecture. 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 induct or current into slope waveform for sub harmonic oscillation prevention. this output controls q1 and q2 via the rs latch. timing of q1 and q2 is precisely adjusted so that they will not turn on at the same time, thus putting them into non-overlapped relation. in the period where q1 is on, energy is accumulated in the exte rnal inductor, and in the period where q1 is off, energy is transferred to the capacitor of vout via q2. further, BD6071HFN has many safety functions, and thei r detection signals stop switching operation at once. 8 765 1234 + + - osc control current sence q + - 24 ? s q r tsd - + vin c in sw vout v fb test en gnda gnd 300k ? 1 f l 22 h c out 1 f r fb - + white led over voltage protect short protect pwmcomp erramp q2 q1
technical note 13/29 www.rohm.com 2011.01 - rev.c ? 2011 rohm co., ltd. all rights reserved. bd6067gu, bd6069gut, bd 6071hfn, bd6072hfn ? BD6071HFN description of functions 1) soft starts and off status BD6071HFN has soft start function and off status function. the soft start function and the off status function pr event large current from flowing to the ic via coil. occurrence of rush current at turning on is prevented by the soft start function, and occurrence of invalid current at turning off is prevented by the off status function. 2) isolation control BD6071HFN has isolation control to prevent led wrong lighting at power off. the cause of the led wrong lighting is leak current from vin to the white led. therefore, when BD6071HFN gets in power off (en = l), the isolation control cuts the dc path between sw and vout, thereby the leak current from vin to led is prevented. fig.36 isolation control 3) short-circuit protection and over voltage protection BD6071HFN has short-circuit protection and over voltage prot ection. these detect the voltage of vout, and at error, they stop the output tr. details are as shown below. ? short-circuit protection in the case of short-circuit of the dc/dc output (vou t) to gnd, the coil or the ic may be destructed. therefore, at such an error as vout becoming 0.7v or below, the under detect or shown in the figure works, and turns off the output tr, and prevents the coil and the ic from being destructed. and the ic changes from its action condition into its non-acti on condition, and current does not flow to the coil (0ma). ? over voltage protection at such an error as the ic and the led being cut off, over voltage causes the sw terminal and the vout terminal exceed the absolute maximum ratings, and may destruct the ic. therefore, when vout becomes 14.5v or higher, the over voltage limit works, and turns off the output tr , and prevents the sw terminal and the vout terminal from exceeding the absolute maximum ratings. at this moment, the ic changes from its action condition in to its non action condition, and the output voltage goes down slowly. and, when the output voltage becomes the hysteresis of the over voltage limit or below, the output voltage goes on up to 14.5v once again. this protection action is shown in fig.37. fig.37 block diagram of short-circuit protection and over voltage 4) thermal shut down BD6071HFN has thermal shut down function. the thermal shut down works at 175 or higher, and while holding the setting of en control from the outside, the ic changes from its action condition into its non action condition. and at 175 or below, the ic gets back to its normal action. vin sw vout vfb white led vout over detector control under detector over voltage ref under voltage ref driver sw cout
technical note 14/29 www.rohm.com 2011.01 - rev.c ? 2011 rohm co., ltd. all rights reserved. bd6067gu, bd6069gut, bd 6071hfn, bd6072hfn ? BD6071HFN start control and brightness control BD6071HFN can control the start conditions by its en terminal, and power off at 0.4v or below, and power on at 1.4v or higher. and by changing the duty of power on and of f by pwm control, the led brightness can be adjusted. two techniques are available for the brightness adjustmen t. one is discrete time (pwm) adjustment, and the other is continuous time adjustment. 1) pwm brightness adjustment is made by giving pwm signal to en as shown in fig.38. the bd6068gu/BD6071HFN t power on/off are according to the pwm signal. by this method, led current is controlled from 0 to the maximum current. the average led current increas es in proportion with the duty cycle of pwm signal. while in pwm off-cycle mode, the ic and led both consume no current s, thus providing a high-effi ciency operation. and please don?t use duty less than 5% or more than 95% of current setting for the brightness adjustment because of the influence of turning on and off operating is large. t he recommended pwm frequency is 100hz ~ 300hz. fig.38 the brightness adjustment example of en terminal by pwm (f pwm = 100hz ~ 300hz) 2-1) the continuous time the brightne ss adjustment is made by giving dc contro l voltage to vfb pin of bd6068gut / BD6071HFN via a series resistor as shown in fig.39. le d luminance (current) changed by giving dc voltage to vfb directly. dc voltage is given from filter ed one of dac signal, or pwm signal sh own in fig.41. the advantage of this approach is that the pwm signal to be used to control the led brightness can be se t to a high frequency (1khz or higher). and please don?t use duty less than 5% or more than 95 % of current setting for the brightness adjustment. led current (iled) is approximat ed by the following equation. iled = [{(vfb-dac) / r1} r2 + vfb ] / rfb vin sw vout en gnda test gnd vfb 22 h 1 f 24 ? 4.7k ? 22k ? vin dac r2 r1 rfb iled fig.39 the brightness adjustment example by dac vin sw vout en gnda test gnd vfb 22 h 1 f 30 ? 33k ? 47k ? 47nf 100k ? vin pwm iled 10khz 0 2.85v fig.41 the brightness adjustment example of vfb terminal by pwm (f pwm =10khz) 0 5 10 15 20 25 0 102030405060708090100 hi duty [%] iled [ma] fig.42 vfb pwm control fig.40 dac adjustment -5 0 5 10 15 20 25 30 00.511.522.533.54 1 1.5 2 2.5 3 3.5 4 30 25 20 15 10 5 0 -5 0 0.5 iled [ma] dac [v] (vfb=500mv) vin sw vout en gnda test gnd vfb 22h 1f 24 ? vin pwm
technical note 15/29 www.rohm.com 2011.01 - rev.c ? 2011 rohm co., ltd. all rights reserved. bd6067gu, bd6069gut, bd 6071hfn, bd6072hfn ? BD6071HFN 2-2) the brightness adjustment of below is done in adjusting of r2 on time by r1 and duty cycle of pwm. the minimum value of the led current is decided by vfb / r1 at the pwm 0%, the maximum value of the led current is decided by vfb / r2 at the pwm 100%. i led is given as shown below. iled=vfb / r1 + vfb / r2 hi duty standard pwm frequency is 100hz~1khz. and please don?t use dut y less than 5% or more than 95% of current setting for the brightness adjustment. fig.43 the brightness adjustment example of vfb terminal by pwm (f pwm =100hz ~ 1khz) setting range of led current led current is determined by the voltage of vfb and the resistor connected to vfb terminal. i led is given as shown below. i led =v fb /r fb the current in the standard application is as shown below. v fb =0.5v, r fb =24 ? i led =20.8ma the shaded portion in the figure below is the setting range of led current to become the standar d. in case of using 2led, led current might increase due to over boosting when vout is less than 5.5v. therefore some ics may not be used at desired currents. consequently, for the proper setting of le d current, thoroughly check it for the suitability under use conditions including applicable power supply voltage and temperature. fig.45 recommended circuit diagram fig.46 led setting range of led current vin sw vout en gnda test gnd vfb 22 h 1 f 47 ? vin 47 ? pwm 1khz r2 r1 0 5 10 15 20 25 0 10203040 5060708090100 hi duty [% ] iled [ma] fig.44 vfb pwm control vin=3.1v ~ 4.2v 3led 2led vin=5.5v 0 10 20 30 40 50 60 70 80 7891011121314 vout [v] iled [ma] 2led 3led 0 10 20 30 40 50 60 70 80 5.5 7 8.5 10 11.5 13 vout [v] iled [ma] 14 vin sw vout en gnda test gnd vfb 22 h 1 f 24 ? vin pwm 1 f rfb iled
technical note 16/29 www.rohm.com 2011.01 - rev.c ? 2011 rohm co., ltd. all rights reserved. bd6067gu, bd6069gut, bd 6071hfn, bd6072hfn fig.47 pcb layout image cin rfb en test vfb gnda vin vout sw gnd cout to battery power source to battery gnd l1 ? BD6071HFN 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 tolerance manufacturer product number size (mm) dcr( ? ) w l h 22 h 10% murata lqh32cn220 k53 2.5 3.2 1.55 0.71 22 h 20% tdk vlf3012at220mr33 2.6 2.8 1.2 0.66 22 h 20% coil craft do1608 4.45 6.6 2.92 0.37 22 h 20% tdk vlf3010at220mr33 2.6 2.8 1.0 1.30 please refer to the reference data of p.11 for the change in the efficiency when the coil is changed. ? capacitor value manufacturer product number size (mm) temperature range l w h 1f murata grm188b11a105k 1.6 0.8 0.8 -25deg~+85deg 1f murata grm188b31e105k 1.6 0.8 0.8 -25deg~+85deg ? resistor value tolerance manufacturer product number size (mm) l w h 24 ? 1% rohm mcr006yzpf24r0 0.6 0.3 0.23 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. the bd6068gut/bd6071h fn is designed for the inductance value of 22h. do not use other inductance value. select a capacitor of ceramic ty pe with excellent frequency and temperature characteristics. further, select capacitor to be used for cin/cout with small di rect current resistance, and pay sufficient attention to the pcb layout shown in the next page. pcb layout in order to make the most of the perfo rmance of this ic, its pcb layout is very important. characteristics such as efficiency and ripple and the likes change greatly with layout, which please note carefully. connect the input bypath capacitor cin nearest to between vin and gnda pin, as shown in the upper diagram. thereby, the input voltage ripple of the ic can be reduced. and, connect the output capacitor cout nearest to between vout and gnd pin. thereby, the output voltage ripple of the ic can be reduced. connect the current setting rfb nearest to vfb pin. connect the gnd connection side of rfb directly to gnd pin. connect the gnda pin directly to gnd pin. when those pins are not connected directly near the chip, infl uence is given to the performance of bd6068/BD6071HFN 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. and keep the pins that are subject to the influence like vfb pin away from the wire to sw. the pcb layout in consideration of these is shown in the fig.49.
technical note 17/29 www.rohm.com 2011.01 - rev.c ? 2011 rohm co., ltd. all rights reserved. bd6067gu, bd6069gut, bd 6071hfn, bd6072hfn 112mvpp vout ? BD6071HFN recommended pcb layout front surface (top view) bottom surface (top view) fig.49 pcb layout (vbat=3.6v, ta=25 , vout=14v, 20ma load) fig.48 output noise
technical note 18/29 www.rohm.com 2011.01 - rev.c ? 2011 rohm co., ltd. all rights reserved. bd6067gu, bd6069gut, bd 6071hfn, bd6072hfn ? bd6069gut, bd6072hfn absolute maximum ratings (ta=25 ) parameter symbol ratings unit conditions power supply voltage 1 vmax1 7 * 1 v vin,en,vfb,test power supply voltage 2 vmax2 20 * 1 v sw,vout power dissipation bd6069gut pd 800 * 2 mw 50mm58mm1.75mm at glass epoxy board mounting. bd6072hfn 630 * 3 mw 70mm70mm1.6mm at glass epoxy board mounting. operating temperature range topr -30 ~ +85 storage temperature range tstg -55 ~ +150 *1 these values are based on gnd and gnda pins. *2 when it?s used by more than ta=25 , it?s reduced by 6.4mw/ . *3 when it?s used by more than ta=25 , it?s reduced by 5.04mw/ . recommended operating range (ta=-30 ~ +85 ) parameter symbol ratings unit conditions min. typ. max. operating supply voltage bd6069gut vin 2.7 3.6 5.5 v bd6072hfn electrical characteristics (unless otherwise specified ta = +25 , vin=3.6v) parameter symbol limits unit conditions min. typ. max. en threshold voltage (low) vthl - - 0.4 v en threshold voltage (high) vthh 1.4 - - v en terminal input current iin - 18.3 30.0 a en=5.5v en terminal output current iout -2.0 -0.1 - a en=0 input voltage range vin 3.1 - 5.5 v quiescent current iq - 0.1 2.0 a en=0v current consumption idd - 1.1 1.5 ma en=2.6v,vfb=1.0v,vin=3.6v feedback voltage vfb 0.47 0.50 0.53 v inductor current limit icoil 270 350 430 ma vin=3.6v *1 sw saturation voltage vsat - 0.14 0.28 v isw=200ma, vout=13v sw on resistance p ronp - 2.1 3.2 ? ipch=200ma,vout=13v switching frequency fsw 0.8 1.0 1.2 mhz duty cycle limit duty 82.7 85.0 - % vfb=0v output voltage range vo - - 18.0 v over voltage limit ovl 18.0 18.5 19.0 v vfb=0v start up time ts - 0.5 1.0 ms *1 this parameter is tested with dc measurement.
technical note 19/29 www.rohm.com 2011.01 - rev.c ? 2011 rohm co., ltd. all rights reserved. bd6067gu, bd6069gut, bd 6071hfn, bd6072hfn ? bd6069gut, bd6072hfn electrical characteristic curves (reference data) 60 65 70 75 80 85 90 10 15 20 25 30 35 40 iled [ma] efficiency [%] vin=5.5v vin=3.1v vin=4.2v vin=3.6v fig.60 led open output voltage fig.55 efficiency vs. led current in each coil < 3led > (vout=10.5v, vin=3.6v, ta=25 ) fig.50 current consumption vs power source voltage fig.51 quiescent current vs power source voltage fig.53 efficiency vs. led current in each coil < 3led > (vout=10.5v, vin=3.6v, ta=25 ) fig.54 efficiency vs. led current in each coil < 4led > (vout=14v, vin=3.6v, ta=25 ) fig.52 oscillation frequency vs. power source voltage fig.57 inductor current limits vs. temperature fig.58 output power vs. power source voltage fig.59 feedback voltage vs. power source voltage (iled=20ma) fig.61 led luminance adjustment ( vin = 3.6v, ta = 25 , 3led, 20ma load ) fig.56 efficiency vs. led current in each coil < 4led > (vout=14v, vin=3.6v, ta=25 ) 10ms a ve iin =1.5ma S v=1.57v ( 4ms/div ) iin 200ma/di v vout 1v/di v ( 4ms/div ) iin 200ma/di v iled 20ma/di v vout 5v/div en 2v/di v 0.0 1.0 2.0 3.0 4.0 5.0 2.533.5 44.555.5 vin [v] iin [ma] ta =25 ta =-3 0 ta =85 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 2.533.5 44.555.5 vin [v] iin [a] ta=-30, 25, 85 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 2.53 3.544.5 55.5 vin [v] switching fr eqency [mhz] ta =25 ta =-3 0 ta =85 60 65 70 75 80 85 90 10 15 20 25 30 35 40 iled [ma] efficiency [%] coilcraft : do1608c-223 tdk:vlcf4020t-220mr56 murata:lqh32cn220k53 tdk:vlf3012at-220mr33 60 65 70 75 80 85 90 10 15 20 25 30 35 40 iled [ma] efficiency [%] coilcraft : do1608c-223 tdk:vlcf4020t-220mr56 murata:lqh32cn220k53 tdk:vlf3012at-220mr33 60 65 70 75 80 85 90 10 15 20 25 30 35 40 iled [ma] efficiency [%] vin=5.5v vin=3.1v vin=4.5v vin=3.6v 270 290 310 330 350 370 390 410 430 -30 -10 10 30 50 70 tempar ature [ ] iin [ma] 85 vin=5.5v vin=3.1v vin=3.6v 0 500 1000 1500 2000 2.5 3 3.5 4 4.5 vin [v] output power [mw ] ta =85 ta =25 ta =-3 0 0.47 0.48 0.49 0.5 0.51 0.52 0.53 2.53 3.544.5 55.5 vin [v] vfb [v] ta =85 ta =25 ta =-3 0
technical note 20/29 www.rohm.com 2011.01 - rev.c ? 2011 rohm co., ltd. all rights reserved. bd6067gu, bd6069gut, bd 6071hfn, bd6072hfn 8 76 5 1234 ? bd6069gut, bd6072hfn block diagram, recommended circuit example, pin location diagram fig.62 block diagram and recommended circuit diagram fig.63 pin location diagram vcsp60n1 (bottom view) fig.64 pin location diagram hson8 (top view) pin assignment table pin name in/out ball number function bd6069gut bd6072hfn gnda - a1 1 analog gnd en in a2 2 enable control (pull down is integrated on resistance) test in a3 3 test input (pull down is integrated on resistance) vin in b1 8 power supply input vfb in b3 4 feedback input voltage vout out c1 7 output sw in c2 6 switching terminal gnd - c3 5 power gnd operation bd6069gut is a fixed frequency pwm current mode dc/dc conv erter, and adopts synchronous rectification architecture. 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 induct or current into slope waveform for sub harmonic oscillation prevention. this output controls q1 and q2 via the rs latch. timing of q1 and q2 is precisely adjusted so that they will not turn on at the same time, thus putting them into non-overlapped relation. in the period where q1 is on, energy is accumulated in the external inductor, and in the period where q1 is off, energy is transferred to the capacitor of vout via q2. further, bd6069gut/bd6072hfn has many safety functions, and their detection signal s stop switching operation at once. + + - osc control current sence q + - 24 ? s q r tsd - + vin c in sw vout v fb test en gnda gnd 300k ? 1f l 22h c out 1f r fb - + white led over voltage protect short protect pwmcomp erramp q2 q1 c1 b1 a1 a2 a3 b3 c3 c2
technical note 21/29 www.rohm.com 2011.01 - rev.c ? 2011 rohm co., ltd. all rights reserved. bd6067gu, bd6069gut, bd 6071hfn, bd6072hfn ? bd6069gut, bd6072hfn description of functions 1) soft starts and off status bd6069gut/bd6072hfn has soft start function and off status function. the soft start function and the off status function pr event large current from flowing to the ic via coil. occurrence of rush current at turning on is prevented by the soft start function, and occurrence of invalid current at turning off is prevented by the off status function. 2) isolation control bd6069gu/bd6072hfn t has isolation control to prevent led wrong lighting at power off. the cause of the led wrong lighting is leak current from vin to the white led. therefore, when bd6069gut/bd6072hfn gets in power off (e n = l), the isolation control cuts the dc path between sw and vout, thereby the leak current from vin to led is prevented. fig.65 isolation control 3) short-circuit protection and over voltage protection bd6069gut/bd6072hfn has short-circuit protection and over voltage protection. these detec t the voltage of vout, and at error, they stop the output tr. details are as shown below. ? short-circuit protection in the case of short-circuit of the dc/dc output (vou t) to gnd, the coil or the ic may be destructed. therefore, at such an error as vout becoming 0.7v or below, the under detect or shown in the figure works, and turns off the output tr, and prevents the coil and the ic from being destructed. and the ic changes from its action condition into its non acti on condition, and current does not flow to the coil (0ma). ? over voltage protection at such an error as the ic and the led being cut off, over voltage causes the sw terminal and the vout terminal exceed the absolute maximum ratings, and may destruct the ic. therefore, when vout becomes 18.5v or higher, the over voltage limit works, and turns off the output tr , and prevents the sw terminal and the vout terminal from exceeding the absolute maximum ratings. at this moment, the ic changes from its action condition in to its non action condition, and the output voltage goes down slowly. and, when the output voltage becomes the hysteresis of the over voltage limit or below, the output voltage goes on up to 18.5v once again. this protection action is shown in fig.66. fig.66 block diagram of short-circuit protection and over voltage 4) thermal shut down bd6069gut/bd6072hfn has thermal shut down function. the thermal shut down works at 175 or higher, and while holding the setting of en control from the outside, the ic changes from its action condition into its non action condition. and at 175 or below, the ic gets back to its normal action. vin sw vout vfb white led vout over detector control under detector over voltage ref under voltage ref driver sw cout
technical note 22/29 www.rohm.com 2011.01 - rev.c ? 2011 rohm co., ltd. all rights reserved. bd6067gu, bd6069gut, bd 6071hfn, bd6072hfn ? bd6069gut, bd6072hfn start control and brightness control bd6069gut/bd6072hfn can control the start conditions by its en terminal, and power off at 0.4v or below, and power on at 1.4v or higher. and by changing the duty of power on and off by pwm control, the led brightness can be adjusted. two techniques are available for the brightness adjustmen t. one is discrete time (pwm) adjustment, and the other is continuous time adjustment. 1) pwm brightness adjustment is made by giving pwm signal to en as shown in fig.67. the bd6069gut/bd6072hfn power on/off is according to the pw m signal. by this method, led current is controlled from 0 to the maximum current. the average led current increases in proportion with the duty cycle of pwm signal. while in pwm off-cycle mode, the ic and led both consume no currents, thus providing a high-effi ciency operation. and please don?t use duty less than 5% or more than 95% of current setting for the brightness adjustment because of the influence of turning on and off operating is large. t he recommended pwm frequency is 100hz ~ 300hz. fig.67 the brightness adjustment example of en terminal by pwm (fpwm = 100hz ~ 300hz) 2-1) the continuous time the brightne ss adjustment is made by giving dc contro l voltage to vfb pin of bd6069gut / bd6072hfn via a series resistor as shown in fig.68. le d luminance (current) changed by giving dc voltage to vfb directly. dc voltage is given from filter ed one of dac signal, or pwm signal sh own in fig.70. the advantage of this approach is that the pwm signal to be used to control the led brightness can be se t to a high frequency (1khz or higher). and please don?t use duty less than 5% or more than 95 % of current setting for the brightness adjustment. led current (iled) is approximat ed by the following equation. iled = [{(vfb-dac) / r1} r2 + vfb ] / rfb vin sw vout en gnda test gnd vfb 22h 1f 24 ? vin pwm fig.68 the brightness adjustment example by dac vin sw vout en gnda test gnd vfb 22h 1f 30? 33k ? 47k ? 47nf 100k ? vin pwm iled 10khz 0 2.85v fig.70 the brightness adjustment example of vfb terminal by pwm (f pwm =10khz) 0 5 10 15 20 25 0 102030405060708090100 hi du ty [%] i led [ma] fig.71 vfb pwm control fig.69 dac adjustment -5 0 5 10 15 20 25 30 00.511.522.533.54 1 1.5 2 2.5 3 3.5 4 30 25 20 15 10 5 0 -5 0 0.5 iled [ma] dac [v] (vfb=500mv) vin sw vout en gnda test gnd vfb 22h 1f 24? 4.7k ? 22k ? vin dac r2 r1 rfb iled
technical note 23/29 www.rohm.com 2011.01 - rev.c ? 2011 rohm co., ltd. all rights reserved. bd6067gu, bd6069gut, bd 6071hfn, bd6072hfn ? bd6069gut, bd6072hfn 2-2) the brightness adjustment of below is done in adjusting of r2 on time by r1 and duty cycle of pwm. the minimum value of the led current is decided by vfb / r1 at the pwm 0%, the maximum value of the led current is decided by vfb / r2 at the pwm 100%. i led is given as shown below. iled=vfb / r1 + vfb / r2 hi duty standard pwm frequency is 100hz~1khz. and please don?t use dut y less than 5% or more than 95% of current setting for the brightness adjustment. fig.72 he brightness adjustment example of vfb terminal by pwm (f pwm =100hz~1khz) setting range of led current led current is determined by the voltage of vfb and the resistor connected to vfb terminal. i led is given as shown below. i led =v fb /r fb the current in the standard application is as shown below. v fb =0.5v, r fb =24 ? i led =20.8ma the shaded portion in the figure below is the setting range of led current to become the standard. depending on coils and white leds to be used, however, some ics may not be used at desired currents. consequently, for the proper setting of led current, thoroughly check it for the suitability under us e conditions including applicable power supply voltage and temperature. vin sw vout en gnda test gnd vfb 22h 1f 24 ? vin pwm 1f rfb iled fig.74 recommended circuit diagram vin sw vout en gnda test gnd vfb 22h 1f 47 ? vin 47 ? pwm 1khz r2 r1 fig.75 setting range of led current fig.73 vfb pwm control 0 5 10 15 20 25 0 102030405060708090100 hi duty [%] iled [ma] 0 10 20 30 40 50 60 70 80 7 8 9 101112131415161718 vout[v] iled[ma]
technical note 24/29 www.rohm.com 2011.01 - rev.c ? 2011 rohm co., ltd. all rights reserved. bd6067gu, bd6069gut, bd 6071hfn, bd6072hfn ? bd6069gut, bd6072hfn 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 tolerance manufacturer product number size (mm) dcr (? ) w l h 22 h 10% murata lqh32cn220 k53 2.5 3.2 1.55 0.71 22 h 20% tdk vlf3012at220mr33 2.6 2.8 1.2 0.66 22 h 20% coil craft do1608 4.45 6.6 2.92 0.37 22 h 20% tdk vlf3010at220mr33 2.6 2.8 1.0 1.30 please refer to the reference data of p.20 for the ch ange in the efficiency when the coil is changed. ? capacitor value manufacturer product number size (mm) temperature range l w h 1f murata grm188b11a105k 1.6 0.8 0.8 -25deg~+85deg 1f murata grm188b31e105k 1.6 0.8 0.8 -25deg~+85deg ? resistor value tolerance manufacturer product number size (mm) l w h 24? 1% rohm mcr006yzpf24r0 0.6 0.3 0.23 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. the bd6069gutt/bd6072h fn is designed for the inductance value of 22h. do not use other inductance value. select a capacitor of ceramic ty pe with excellent frequency and temperature characteristics. further, select capacitor to be used for cin/cout with small di rect current resistance, and pay sufficient attention to the pcb layout shown in the next page. pcb layout in order to make the most of the performanc e of this ic, its pcb layout is very im portant. characteristics such as efficiency and ripple and the likes change greatly with pcb layout, which please note carefully. fig.76 bd6069gut pcb layout image fig.77 bd6072hfn pcb layout image gnda en test vin vfb vout sw gnd cin cout to battery gnd rfb to battery power source l1 cin rfb en test vfb gnda vin vout sw gnd cout to battery power source to battery gnd l1
technical note 25/29 www.rohm.com 2011.01 - rev.c ? 2011 rohm co., ltd. all rights reserved. bd6067gu, bd6069gut, bd 6071hfn, bd6072hfn v g vout vout gnd sw ? bd6069gut, bd6072hfn connect the input bypath capacitor cin nearest to between vin and gnda pin, as shown in t he upper diagram. thereby, the input voltage ripple of the ic can be reduced. and, connec t the output capacitor cout nearest to between vout and gnd pin. thereby, the output voltage ripple of the ic can be reduced. connect the cu rrent setting rfb nearest to vfb pin. connect the gnd connection side of rfb directly to gnd pin. connect the gnda pin directly to gnd pin. when those pins are not connected directly near the chip, influence is giv en to the performance of bd6069gut /bd6072hfn, and may limit the current drive performance. as for the wi re to the inductor, make its resistance component small so as to reduce electric power consumption and increase the entire efficiency. and keep the pins that are subject to the influence like vfb pin away from the wire to sw. the pcb layout in consideration of these is shown in the fig.79 to 82. recommended pcb layout fig.79 bd6069gut fig.80 bd6069gut front surface (top view) bottom surface (top view) v g vb at gnd en fb vout rfb cout l1 vout led led ci n gnda led sw 112mvpp vout (vbat=3.6v, ta=25 , vout=14v, 20ma load) fig.78 output noise
technical note 26/29 www.rohm.com 2011.01 - rev.c ? 2011 rohm co., ltd. all rights reserved. bd6067gu, bd6069gut, bd 6071hfn, bd6072hfn ? bd6069gut, bd6072hfn recommended pcb layout attention point of pcb layout in pcb design, the wiring of power supply line should be low impedance, and put the bypass capacitor if necessary. especially the wiring impedance must be lower around the dc/dc converter. about heat loss in heat design, operate the dc/dc conv erter in the following condition. (the following temperature is a guarantee te mperature, so consider the margin.) 1. periphery temperature ta must be less than 85 . 2. the loss of ic must be less than dissipation pd. fig.81 bd6072hfn front surface (top view) fig.82 bd6072hfn bottom surface (top view)
technical note 27/29 www.rohm.com 2011.01 - rev.c ? 2011 rohm co., ltd. all rights reserved. bd6067gu, bd6069gut, bd 6071hfn, bd6072hfn notes for use 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 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 an d the gnd terminal. at the same time, in order to use an electrolytic capacitor, thoroughly check to be sure the ch aracteristics of the capacitor to be used present no problem including the occurrence of capacity dropout at a low temperature, thus determining the constant. 5) gnd voltage make setting of the potential of the gnd terminal so that it will be maintained at the minimum in any operating state. furtherm ore, 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 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. 7) operation in strong electromagnetic field be noted that using ics in the strong elec tromagnetic field can malfunction them. 8) inspection with set pcb on the inspection with the set pcb, if a capacitor is connec ted to a low-impedance ic terminal, the ic can suffer stress. therefore, be sure to discharge from the set pcb by each proc ess. furthermore, in order to mount or dismount the set pcb to/from the jig for the inspection process, be sure to 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. 9) 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. 10) ground wiring pattern if small-signal gnd and large-current gnd are provided, it will be recommended to separate the large-current gnd pattern from the small-signal gnd pattern and establish a si ngle ground at the reference poi nt of the set pcb so that resistance to the wiring pattern and voltage fluctuations due to a large current will cause no fluc tuations in voltages of the small-signal gnd. pay attention not to cause fluctuations in the gnd wiring pattern of external parts as well. 11) external capacitor in order to use a ceramic capacitor as the external capaci tor, determine the constant with consideration given to a degradation in the nominal capacitance due to dc bias and c hanges in the capacitance due to temperature, etc. 12) thermal shutdown circuit (tsd) when junction temperatures become 175 (typ) or higher, the thermal shutdown circuit operates and turns a switch off. the thermal shutdown circuit, which is 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. 13) 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. 14) selection of coil select the low dcr inductors to decrease power loss for dc/dc converter.
technical note 28/29 www.rohm.com 2011.01 - rev.c ? 2011 rohm co., ltd. all rights reserved. bd6067gu, bd6069gut, bd 6071hfn, bd6072hfn ordering part number b d 6 0 6 7 g u - e 2 part no. part no. package gu : vcsp85h1 packaging and forming specification e2: embossed tape and reel b d 6 0 6 9 g u t - e 2 part no. part no. package gut : vcsp60n1 packaging and forming specification e2: embossed tape and reel ? 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 3000pcs e2 () direction of feed reel 1pin (unit : mm) vcsp85h1 (bd6067gu) s 0.08 s a b b a 0.05 1pin mark 3 0.34 0.1 8- 0.3 0.05 1.68 0.1 2 ( 0.15)index post c 1 0.34 0.1 b 1.0max 1.68 0.1 a 0.25 0.1 p=0.5 2 p=0.5 2 (unit : mm) vcsp60n1 (bd6069gut) 1.68 0.05 1.68 0.05 1pin mark s 0.08 s 0.21 0.05 0.6 0.08 a b 3 p=0.5 2 8- 0.3 0.05 2 c 1 ( 0.15)index post p=0.5 2 b 0.34 0.05 a 0.34 0.05 0.05 a b ? 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 3000pcs e2 () direction of feed reel 1pin
technical note 29/29 www.rohm.com 2011.01 - rev.c ? 2011 rohm co., ltd. all rights reserved. bd6067gu, bd6069gut, bd 6071hfn, bd6072hfn b d 6 0 7 1 h f n - t r part no. part no. 6071 6072 package hfn : hson8 packaging and forming specification tr: embossed tape and reel direction of feed reel ? 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 right when you hold reel on the left hand and you pull out the tape on the right hand 3000pcs tr () 1pin (unit : mm) hson8 8765 2.8 0.1 0.13 +0.1 ?.05 (0.2) (1.8) 0.6max (0.15) (2.2) (0.3) (0.45) 2.9 0.1 0.32 0.1 (0.2) 3.0 0.2 (max 3.1 include. burr) 0.475 (0.05) 0.65 1pin mark 0.02 +0.03 ?.02 4 3 12 0.08 m s 0.1 s 4321 5678
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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