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BD9152MUV Datasheet(PDF) 9 Page - Rohm |
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BD9152MUV Datasheet(HTML) 9 Page - Rohm |
9 / 17 page BD9152MUV Technical Note 9/16 www.rohm.com 2010.04 - Rev.C ○ c 2010 ROHM Co., Ltd. All rights reserved. ・ Short-current protection circuit with time delay function Turns OFF the output to protect the IC from breakdown when the incorporated current limiter is activated continuously for the fixed time(TLATCH) or more. The output thus held tuned OFF may be recovered by restarting EN or by re-unlocking UVLO. Fig.31 Short-current protection circuit with time delay timing chart ● Switching regulator efficiency Efficiency ŋ may be expressed by the equation shown below: Efficiency may be improved by reducing the switching regulator power dissipation factors PDα as follows: Dissipation factors: 1) ON resistance dissipation of inductor and FET:PD(I 2R) 2) Gate charge/discharge dissipation:PD(Gate) 3) Switching dissipation:PD(SW) 4) ESR dissipation of capacitor:PD(ESR) 5) Operating current dissipation of IC:PD(IC) 1)PD(I 2R)=IOUT2×(RCOIL+RON) (RCOIL[Ω]:DC resistance of inductor, RON[Ω]:ON resistance of FET, IOUT[A]:Output current.) 2)PD(Gate)=Cgs×f×V (Cgs[F]:Gate capacitance of FET, f[H]:Switching frequency, V[V]:Gate driving voltage of FET) 4)PD(ESR)=IRMS 2×ESR (IRMS[A]:Ripple current of capacitor, ESR[Ω]:Equivalent series resistance.) 5)PD(IC)=Vin×ICC (ICC[A]:Circuit current.) η = VOUT×IOUT Vin×Iin × 100[%]= POUT Pin × 100[%]= POUT POUT+PDα × 100[%] Vin 2×CRSS×IOUT×f IDRIVE 3)PD(SW)= (CRSS[F]:Reverse transfer capacitance of FET, IDRIVE[A]:Peak current of gate.) Output Short circuit Threshold Voltage IL Limit EN Timer latch EN Standby mode Operating mode Operating mode Standby mode EN1=EN2 t2=TLATCH VOUT2 IL1 t1<TLATCH Output OFF Latch |
Similar Part No. - BD9152MUV_10 |
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Similar Description - BD9152MUV_10 |
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