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BD9151MUV Datasheet(PDF) 8 Page - Rohm |
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BD9151MUV Datasheet(HTML) 8 Page - Rohm |
8 / 17 page Technical Note BD9151MUV 8/16 www.rohm.com 2009.08 - Rev.A © 2009 ROHM Co., Ltd. All rights reserved. ・ Short-current protection circuit with time latch 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 Timer latch short-current protection 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.) SCP Threshold voltage IL Limit EN Timer latch EN Standby mode Active mode Active mode Standby mode EN t2=TLATCH VOUT2 IL1 t1<TLATCH VOUT1 Output voltage OFF latch IL2 η= V OUT× 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.) |
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