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BD6076GUT 1/15 www.rohm.com 2011.12 - rev. a ? 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) BD6076GUT description the BD6076GUT is a white led driver ic with sync hronous rectification that can drive up to 4leds. with synchronous rectification (no external schottky diode required) and small package, they can save mount space. and the brightness of led can be adjus ted by using pwm pulse on en pin. features 1) synchronous rectific ation boost dc/dc converter 2) no external schottky diode required 3) driving 4 series white leds 4) internal load disconnect sw 5) over voltage protection 6) protect open and short output 7) thermal shut down 8) brightness adjustment by external pwm pulse 9) small and thin csp package in 8pins applications white led backlight torch light and easy flash for camera of mobile phone absolute maximum ratings (ta=25 ) parameter symbol ratings unit condition maximum applied voltage 1 vmax1 7 * 1 v vin, en, vfb, test maximum applied voltage 2 vmax2 20 * 1 v sw, vout, voutput power dissipation pd 800 * 2 mw operating temperature range topr -30~+85 storage temperature range tstg -55~+150 *1 these values are based on gnd and gnda pins. *2 50mm58mm1.75mm at glass epoxy board mount ing. when it?s used by more than ta=25 , it?s reduced by 6.4mw/ . operating range ta = - 3 0 ~+85 parameter symbol ratings unit condition min. typ. max. power supply voltage vin 2.7 3.6 5.5 v no.11040eat40
technical note 2/15 BD6076GUT www.rohm.com 2011.12 - rev. a ? 2011 rohm co., ltd. all rights reserved. electrical characteristics unless otherwise specified ta =-30 ~+85 , vin=3.1~5.5v parameter symbol limits unit condition min. typ. max. [ en terminal ] en threshold voltage (low) vthl - - 0.4 v en threshold voltage (high) vthh 1.2 - - v en terminal input current iin - 18.3 30.0 a en=5.5v en terminal output current iout -2.0 0.0 - a en=0v [ switching regulator ] quiescent current iq - 0.1 2.0 a en=0v current consumption idd - 1.0 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 310 400 490 ma vin=3.6v *1 sw saturation voltage vsat - 0.14 0.28 v isw=200ma vout pmos resistance ronp - 2.1 3.2 ? ipch=200ma,vout=13v voutput pmos resistance rpsw - 1.8 2.0 ? ipsw=20ma,vout=13v switching frequency fsw 1.0 1.25 1.5 mhz duty cycle limit duty 83.0 91.0 99.0 % vfb=0v output voltage range vo - - 18.0 v over voltage limit ovl 18.0 18.5 19.0 v vfb=0v uvlo detect voltage uvlod 1.75 - 2.25 v falling vin level *1 this parameter is tested with dc measurement.
technical note 3/15 BD6076GUT www.rohm.com 2011.12 - rev. a ? 2011 rohm co., ltd. all rights reserved. test circuit *test circuit a (for inductor current limit, feedback voltage.) procedure ~inducton current limit~ 1. start to increase iout from 0ma gradually. 2. you will find that vout will start to go down and the duty will be decreased. 3. then, you can measure the coil current as ?inductor current limit? ~vfb voltage~ 1. supply 0ma to iout 2. then, you can measure the vfb voltage as ?feedback voltage?. fig.1 test circuit a *test circuit b (for over voltage limit,duty cycle limit, switching frequency) procedure ~over voltage limit~ 1. start to increase vout from 9v to 20v 2. you will find frequency change from around 1mhz to 0hz 3. then,it is ?over voltage limit? ~duty cycle limit, switching frequency ~ 1. supply 9v to vout terminal 2. then,you can measure the duty as ?duty cycle limit? and the frequency and ?switching frequency?. fig.2 test circuit b *test circuit c (for quiescent current, current comsumption, en terminal input/output current, en threshold voltage(low/high)) fig.3 test circuit c icoil vin sw vout en gnda gnd vfb 10h or 22h 1f 24 ? v in rfb a iou t tall ton duty= tall ton monitor v 1f 3.1~5.5v voutput vin sw vout en gnda gnd vfb 1f vin 3.1~5.5v 9v to 20v ta ll ton duty= tall ton monitor 1f voutput vin sw vout en gnda voutput gnd ien 3.1~5.5v a a icc vfb 1uf 0.0~5.5v 1.0v(current comsumption)
technical note 4/15 BD6076GUT www.rohm.com 2011.12 - rev. a ? 2011 rohm co., ltd. all rights reserved. electrical characteristic curves (reference data) 0 2 4 6 8 10 1234567 vin[ v] iin[ma] 0,0 0,2 0,4 0,6 0,8 1,0 1234567 vin[v] iin[ua] 1,0 1,1 1,2 1,3 1,4 1,5 2,5 3 3 ,5 4 4,5 5 5,5 vin[v] fr equ ency [mhz] fig.4 current consumption fig.5 quiesc ent current fig.6 oscillation frequency vs. vs. vs. power supply voltage power supply voltage power supply voltage 47 0 48 0 49 0 50 0 51 0 52 0 53 0 2,7 3,1 3,5 3,9 4,3 4 ,7 5, 1 5,5 vin[v] vfb[mv] 300 350 400 450 500 3, 1 3 ,5 3,9 4,3 4 ,7 5,1 5,5 ta [deg] inducto r cur re nt [m a] 50 55 60 65 70 75 80 85 90 10 15 20 25 30 3 5 40 io ut[ma] efficiency[%] fig.7 feedback voltage fig.8 inductor curr ent limit fig.9 efficiency vs. led current vs. vs. (4led=vout13v) power supply voltage temperature 50 55 60 65 70 75 80 85 90 10 15 20 25 30 3 5 40 iout [ma] efficiency [%] 0 20 0 40 0 60 0 80 0 100 0 120 0 140 0 160 0 3,0 3,2 3,4 3,6 3,8 4,0 4,2 vin[v] output p ower[mw] 60 65 70 75 80 85 90 3,1 3,5 3, 9 4,3 4,7 5,1 5,5 vin[v] efficiency[%] fig.10 efficiency vs. led current fig.11 output power fig.12 efficiency (4led=vout13v) vs. vs. coil : tdk vls3010t220m power supply voltage power supply voltage coil : tdk vls3010t220m (load=30ma) coil : tdk vls3010t220m ta =85 ta =25 ta =-30 vin=3.1v vin=3.6v vin=4.2v vin=5.5v ta =25 toko : db3015ck220m tdk : vls3010t220m ta =-30 ta =25 ta =85 ta =25 ta =-30 ta =85 ta =-30 ta =25 ta =85 ta =25 ta =-30 ta =85 ta =25 ta =-30 ta =85 ta =-30 ta =25 ta =85 ta =25 vin=3.6v
technical note 5/15 BD6076GUT www.rohm.com 2011.12 - rev. a ? 2011 rohm co., ltd. all rights reserved. electrical characteristic curves (reference data) ? continued 2.iin =1.66v 5.3ms idd=1.5ma 1.vout 1v/div ac 2.iin 200ma/div dc (4ms/div) 1.vout peak=1 55ma 1.en 4.icoi l 3.vfb 2.vou t vo utdrop=76mvp p 1.en 2v/div dc 2.vou t 100 mv/div a c 3.vfb 0.5v/d iv dc 4.ii n 200 ma/div dc (3ms/div) fig.13 led open output voltage fig.14 led brightness adjustment fig.15 soft start (cout=4.7h, iled=15ma) (cout=4.7h, iled=15ma) vin=3.6v ta =25 1.en 2.vout 3. vfb 4. iin peak=410ma 1.en 5v/div dc 2.vout 5v/div dc 3.vfb 0.5v/div dc 4.iin 200ma/div dc (200 s/div ) 0 50 10 0 15 0 20 0 25 0 30 0 35 0 40 0 45 0 50 0 0 102030405060708090100 duty[%] vfb[mv] vin=4.2v vin=3.6v vin=5.5v vin=3.1v fig.16 led brightness adjustment for pwm control 0 10 20 30 40 50 0246810 duty[%] vfb[mv] vin=3.6v vin=3.1v vin=4.2v vin=5.2v fig.17 led brightness adjustment for pwm control (expansion) fig.18 vbat line transient (cout=4.7h, iled=15ma) vin: 3.1v ? 2.8v 1.vin 200mv/div dc 2.vout 100mv/div ac 3.vfb 50mv/div ac 1.vin 2.vout 3. vfb 3.1v 2.8v 600 s 10 s 10 s vout=100mvpp vfb=30mvpp
technical note 6/15 BD6076GUT www.rohm.com 2011.12 - rev. a ? 2011 rohm co., ltd. all rights reserved. block diagram and pin configuration tsd - + sw over vo lt age protect - + s h or t pr o t ec t vo ut vin + + - osc control c ur ren t sence q + - s q r en gnd pw mcomp erramp v fb gnda th erma l sh utd own voutput uvlo - + sho rt pr otec t c in l 10 h or 22 h c out r fb white led q1 q2 fig.19 block diagram and recommended circuit diagram c1 b1 a1 a2 a3 b3 c3 c2 fig.20 pin location diagram vcsp60n1( 8 pin ) pin assignment table pin name in/out ball number function gnda - a1 analog gnd en in a2 enable control (pull down by inner resistor) voutput in a3 switching output vin in b1 power supply input vfb in b3 feedback voltage input vout out c1 vout, connected to output capacitor sw in c2 switching terminal gnd - c3 power gnd operation BD6076GUT is pwm current mode dc/dc conv erter with fixed frequency. it adopts sy nchronous rectificat ion architecture. the feature of the pwm current mode is that input is the combination of erro r components from the error amplifier, and a current sense signal that contro ls the inductor current into slope waveform for sub harmonic oscillation prevention. this output controls q1 and q2 via the rs latch (fig19). timing of q1 and q2 is prec isely adjusted so that they will not turn on at the same time, thus putting them into non-overlapped relation. in the period when q1 is on, energy is accumulated in the external inductor, and in the period when q1 is off, ener gy is transferred to the capa citor of vout via q2. further more, BD6076GUT has many safety functions, and thei r detection signals stop swit ching operation at once.
technical note 7/15 BD6076GUT www.rohm.com 2011.12 - rev. a ? 2011 rohm co., ltd. all rights reserved. functional descriptions 1) soft start and off status bd6076 has soft start function and off status function. the soft start function and the off status function prev ent 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. as for detailed actions, refer to the block di agram (fig. 21) and the timing chart (fig. 22). ? soft start when vout is smaller than vshort, to decrease charge current pmos is set to off by pmos startup control (in term ?i?). vshort means ?vout short detect voltage?. after vo ut is bigger than vshort, pmos is turned on and start switching. in term ?ii? (vshort < vout < vin), status of cu rrent limiter is ?soft mode?. so ?a? voltage is restricted and ?d? duty is kept low. therefore vout voltage goes up slowly and coil current is restrict ed. in term iii (vout > vin), status of current limiter is ?normal mode?. so ?a? voltage goes up suitable voltage, and ?d? duty goes up slowly. and then vout voltage goes up to required voltage. operation max current current at start 450ma current at pwm 300ma fig. 21 lock diagram of soft start and off status soft mode d d c c u u r r r r e e n n t t l l i i m m i i t t normal mode v v o o u u t t vshor t vi n i i i i i i i i i i i i e e n n fig. 22 timing chart ? off status the gate voltage of the switching tr eit her "h" or "l" at power off depends on t he operation conditi ons at that time. when it is fixed to "h", the switching tr remains to be on, and invalid current from the battery is consumed. in order to prevent this, at power off, d is always fixed to l level. so that, it is possible to prevent invalid current at power off. a d r s q q sw l c led cu rr ent pw m co mp osc r fb b fb vout char ge current off status er ramp soft reference soft current limit pm os startup control
technical note 8/15 BD6076GUT www.rohm.com 2011.12 - rev. a ? 2011 rohm co., ltd. all rights reserved. 2) isolation control BD6076GUT has isolation control to pr event led wrong lighting at power off. the cause of the led wrong lighting is leak current from vin to the white led. therefore, when BD6076GUT powered off (en = l), the isolation control cuts the dc path between sw and vout, so that, it prevents from leak current from vin to led. vin sw vout vfb white led voutput fig.23 isolation control 3) short-circuit protection and over voltage protection bd6076 has short-circuit protection and over voltage protection. these detect the voltage of vout,voutput, 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 (vout) and switched output (vout put) to gnd, the coil or the ic may be destructed. therefore, at such an error as vout, v output becoming 0.7v or below, the unde r detector 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 in a case of 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 destroy the ic. therefore, when vout becomes 18.5v or higher, the over voltage limits 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, turns into non operation condition from op eration condition, and the output voltage goes down slowly. and, when the output voltage becom es 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.24. fig.24 block diagram of short-circuit protection and over voltage 4) thermal shut down BD6076GUT has thermal shut down function. the thermal shut down works at 175 ? c or higher, and while holding the setting of en control from the outside, turns into non operation condition from operat ion condition. and at 175 ? c or below, the ic gets back to its normal operation. vout over detector cont rol under detector over voltage ref under voltage ref driver sw cout under detector under voltage ref voutput
technical note 9/15 BD6076GUT www.rohm.com 2011.12 - rev. a ? 2011 rohm co., ltd. all rights reserved. start control and brightness control BD6076GUT can control the start conditions by its en terminal , and power off at 0.4v or below, and power on at 1.2v or higher. and by changing the duty of power on and of f by pwm control, the led brightness can be adjusted. 1. pwm brightness adjustment is done by giving pwm signal to en as shown in fig.25. the BD6076GUT is powered on/off by the pwm signal. by this method, led current is controlled from 0 to the maximum current. the average led current increases with proportion to the duty cycle of pwm signal. while in pwm off-cycle mode, the ic and led both consume no currents, thus providing a high-efficiency operation. the recommended pwm frequency is 100hz ~ 300hz. fig.25 the brightness adjustment example of en terminal by pwm (fpwm = 100 ~ 300hz) fig.26 the rule of pwm signal of en fb characteristic on pwm function BD6076GUT constantly controls the rising time to dec rease the tolerance of the fb voltage at pwm function. period high pulse period low pulse en en minimum high pulse = 13s (duty = 1/256) range of period = 3.3 ~ 10 ms minimum low pulse = 13s (duty = 255/256) range of period = 3.3 ~ 10 ms en vfb 13 s typ fig.27 vfb signal at pwm fig.28. vfb voltage line regulation (pwm duty=30%) typ fb [mv] 3.1 3.6 5.5 +3% -3% typical target spec vin [v] max min 150mv(average) fb [mv] 500mv 150mv (average) duty 30% time vin sw vout en gnda gnd vfb 10h or 22h 4.7f 33ohm vin pw m 4.7f voutpu t
technical note 10/15 BD6076GUT www.rohm.com 2011.12 - rev. a ? 2011 rohm co., ltd. all rights reserved. vbat characteristic in battery charge transient during battery charger is normally +300mv, 250hz(duty 85%) from a baseline battery voltage 3.1 to 2.8v. in this term, it is necessary that vout voltage noise is less than 200mvp-p. 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 =33 ? i led =15.2ma fig.30 standard application 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 use conditions including applicable power supply voltage and temperature. fig.31 setting range of led current 0 10 20 30 40 50 60 70 80 7 8 9 10 11 12 13 14 15 16 17 18 vout[v] iled[ma] vin sw vout en gnda gnd vfb 10h or 22h 4.7f 33ohm vin pwm 4.7f vo utp ut iled min 16a fig.29. battery voltage transient during charger vbat [v ] 3.1v 300m vp - p 10 s tim e 2.8v 10 s vout [v] tim e less than 200m vp - p 4m s 600 s 3.1v 2.8v ti m e v bat [v]
technical note 11/15 BD6076GUT www.rohm.com 2011.12 - rev. a ? 2011 rohm co., ltd. all rights reserved. selection of external parts recommended external parts are listed as below. when to use other parts than these, sele ct the following equivalent components. ? coil value tolerance manufacturer product number size dcr ( ? ) vertical size horizontal size height 22h 20% murata lqh3np n220mgol 3.0 3.0 0.9 1.10 10h 20% murata lqh3np n100mgol 3.0 3.0 0.9 0.57 22h 20% tdk vlf3010st 220m 2.8 3.0 1.0 0.90 10h 20% tdk vlf3010st 100m 2.8 3.0 1.0 0.49 22h 20% toko db3015c220m 2.6 2.8 1.5 0.60 10h 20% toko db3015c100m 2.6 2.8 1.5 0.29 22h 20% taiyo yuden nr3010t220m 3.0 3.0 1.0 1.24 10h 20% taiyo yuden nr3010t100m 3.0 3.0 1.0 0.54 22h 20% panasonic ellveg 220nn 3.0 3.0 0.9 1.44 10h 20% panasonic ellveg 100nn 3.0 3.0 0.9 0.48 please refer to the reference data of p.4 for the change in the efficiency when the coil is changed. ? capacitor value manufacturer product number size temperature range vertical size horizontal size height cin 1f murata grm188b11a105k 1.6 0.8 0.8 -25 ~+85 4.7f murata grm21bb31a475k 2.0 1.25 1.25 -25 ~+85 cout 1f murata grm188b31e105k 1.6 0.8 0.8 -25 ~+85 4.7f murata grm21bb31e475k 2.0 1.25 1.25 -25 ~+85 ? resistor value tolerance manufacturer product number size vertical size horizontal size height r fb 24 ? 1% rohm mcr006yzpf 0.6 0.3 0.23 value 15 ? 15r0 24 ? 24r0 33 ? 33r0 the coil is the component that is most in fluential to efficiency. select the coil wh ich direct current resistor (dcr) and curre nt - inductance characteristic are excellent. select a capacito r of ceramic type with excellent frequency and temperature characteristics. further, select capacitor to be used for ci n/cout with small direct current resistance, and pay much attention to the pcb layout shown in the next page.
technical note 12/15 BD6076GUT www.rohm.com 2011.12 - rev. a ? 2011 rohm co., ltd. all rights reserved. pcb layout in order to make the most of the performance of this ic, pcb layout is very important. please note that characteristics such as efficiency and ripple will likely to change greatly depending on pcb layout. to battery gnd gnda en voutput vin vfb vout sw gnd cin cout r led to battery power source l1 fig.32 pcb layout connect the input bypath capacitor cin between vin and gnda pin closely, as shown in the upper diagram. thereby, the input voltage ripple of the ic can be reduc ed. and, connect the output capacitor cout between vout and gnd pin closely. thereby, the output voltage ripple of t he ic can be reduced. connect the current setting rled fb pin closely. connect the gnd closely connection side of rled direct ly to gnd pin. connect the gnda pin di rectly to gnd pin. when those pins are not connected directly near the chip, the performance of bd 6076gut shall be influenced and may limit the current drive performance. as for the wire to the inductor, make its resi stance component small to reduce electric power consumption and increase the entire efficiency. please keep away which are s ubject to be influenced like fb pin in wire connection with sw. the layout pattern in consideration of these is shown in the next page. 112mvpp vout (vbat=3.6v, ta=25 o c, vout=14v. 20ma load) fig.33 output noise
technical note 13/15 BD6076GUT www.rohm.com 2011.12 - rev. a ? 2011 rohm co., ltd. all rights reserved. recommended pcb layout fig.34 front surface (top view) fig.35 rear surface (top view) attention point for pcb layout for pcb layout design, the wire of power supply line shoul d be low impedance, and put bypass capacitor if necessary. especially the wiring impedance mu st be low around dc/dc converter. about heat loss for heat design, operate dc/dc conver ter in the following condition. (the following temperature is a guaranteed temperature, margin will be needed.) 1. periphery temperature ta must be less than 85 . 2. the loss of ic must be less than dissipation pd. sw gnd agnd vbat vfb en vout voutput gnd l1 cout cin rfb led led led led
technical note 14/15 BD6076GUT www.rohm.com 2011.12 - rev. a ? 2011 rohm co., ltd. all rights reserved. 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 breaking mode such as a short circuit or an open circuit. if any special mode exceeding the absolute maximum ratings is a ssumed, consideration should be given to take physical safety measures including the use of fuses, etc. 2) operating conditions these conditions represent a range within which characteri stics can be provided approx imately as expected. the electrical characteristics are guaranteed under the conditions of each parameter. 3) reverse connection of power supply connector the reverse connection of power supply connector can br eak down ics. take protec tive measures against the breakdown due to the reverse connection, such as mounting an external diode between the power supply and the ic?s power supply terminal. 4) power supply line design pcb pattern to provide low impedance for the wiring between the power supply and the gnd lines. in this regard, for the digital block power supply and the analog block power supply, even though these power supplies has the same level of potential, separate t he power supply pattern for the digital blo ck from that for the analog block, thus suppressing the diffraction of digital noises to the analog block power supply resulting from impedance common to the wiring patterns. for the gnd line, give consider ation to design the patterns in a similar manner. furthermore, for all power supply terminals to ics, mount a capacitor between the power supply and the gnd terminal. at the same time, in order to use an electrolytic capacito r, thoroughly check to be sure the characteristics of the capacitor to be used present no problem including the occu rrence of capacity dropout at a low temperature, thus determining the constant. 5) gnd voltage make setting of the potential of the gnd terminal so that it will be maintained at the minimum in any operating state. furthermore, check to be sure no terminals are at a potentia l lower than the gnd voltage including an actual electric transient. 6) short circuit between terminals and erroneous mounting in order to mount ics on a set pcb, pay thorough attention to the direction and offset of the ics. erroneous mounting can break down the ics. furthermore, if a short circuit occurs due to foreign matters entering between terminals or between the terminal and the power supply or the gnd terminal, the ics can break down. 7) operation in str ong electromagnetic field be noted that using ics in the strong elec tromagnetic field can malfunction them. 8) inspection with set pcb on the inspection with the set pcb, if a capacitor is connect ed to a low-impedance ic terminal, the ic can suffer stress. therefore, be sure to discharge from t he set pcb by each process. furthermore, in order to mount or dismount the set pcb to/from the jig for the inspection process, be sure to turn off the power supply and then mount the set pcb to the jig. after the completion of the inspection, be sure to tu rn off the power supply and then dismount it from the jig. in addition, for protection against static electricity, establis h a ground for the assembly process and pay thorough attention to the transportation and t he storage of the set pcb. 9) input terminals in terms of the construction of ic, parasitic elements are in evitably formed in relation to potential. the operation of the parasitic element can cause interference with circuit operati on, thus resulting in a malf unction and then breakdown of the input terminal. therefore, pay thorou gh attention not to handle the input te rminals, such as to apply to the input terminals a voltage lower than the gnd respectively, so t hat any parasitic element wi ll operate. furthermore, do not apply a voltage to the input terminals when no power supply voltage is applied to the ic. in addition, even if the power supply voltage is applied, apply to the input terminals a voltage lower than the power supply voltage or within the guaranteed value of electrical characteristics. 10) ground wiring pattern if small-signal gnd and large-current gnd are provided, it will be recommended to separate the large-current gnd pattern from the small-signal gnd pattern and establish a si ngle ground at the reference poi nt of the set pcb so that resistance to the wiring pattern and voltage fluctuations due to a large current will cause no fluctuations in voltages of the small-signal gnd. pay att ention not to cause fluctuations in the gnd wiring pattern of external parts as well. 11) external capacitor in order to use a ceramic capacitor as the external capacitor, determine the c onstant 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 175c (typ) or higher, the thermal shutdown circuit operates and turns a switch off. the thermal shutdown circuit, which is aimed at isolat ing the lsi from thermal runaway as much as possible, is not aimed at the protection or guarantee of the lsi. therefor e, do not continuously use the lsi with this circuit operating or use the lsi assuming its operation. 13) thermal design perform thermal design in which there 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 15/15 BD6076GUT www.rohm.com 2011.12 - rev. a ? 2011 rohm co., ltd. all rights reserved. ordering part number b d 6 0 7 6 gu t - e 2 part no. part no. 6076 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) vcsp60n1 (bd6176gut) 1.68 0.05 1.68 0.05 1pin mark s 0.08 s 0.2min 0.6 0.075 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 (BD6076GUT)
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