Technical Note
10/18
www.rohm.com
2009.08 - Rev.A
?2009 ROHM Co., Ltd. All rights reserved.
BD9153MUV
鸖hort-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.33 Short-current protection circuit with time delay timing chart
?SPAN class="pst BD9153MUV-E2_2471427_8">Switching regulator efficiency
Efficiency K may be expressed by the equation shown below:
Efficiency may be improved by reducing the switching regulator power dissipation factors P
D
?as follows:
Dissipation factors:
1) ON resistance dissipation of inductor and FETPD(I
2
R)
2) Gate charge/discharge dissipationPD(Gate)
3) Switching dissipationPD(SW)
4) ESR dissipation of capacitorPD(ESR)
5) Operating current dissipation of ICPD(IC)
1)PD(I
2
R)=IOUT
2
?RCOIL+RON)
(RCOIL[&]DC resistance of inductor, RON[&]ON resistance of FET, IOUT[A]Output current.)
2)PD(Gate)=Cgs譮譜 (Cgs[F]Gate capacitance of FET, f[H]Switching frequency, V[V]Gate driving voltage of FET)
4)PD(ESR)=IRMS
2
譋SR (IRMS[A]Ripple current of capacitor, ESR[&]Equivalent series resistance.)
5)PD(IC)=Vin譏CC (ICC[A]Circuit current.)
?
VOUT譏OUT
Vin譏in
?00[%]=
POUT
Pin
?00[%]=
POUT
POUT+PD?
?00[%]
Vin
2
證RSS譏OUT譮
IDRIVE
3)PD(SW)=
(CRSS[F]Reverse transfer capacitance of FET, IDRIVE[A]Peak current of gate.)
Output Short circuit
Threshold Voltage
IL Limi
EN
Timer latch
EN
Standby
mode
Operating mode
Operating mode
Standby
mode
EN
t2LATCH
OUT2
Io1
t1LATCH
Output OFF
Latch
OUT1
OUT3
t3=TLATCH
Io2
Io3
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