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BD9130NV Datasheet(PDF) 11 Page - Rohm

Part # BD9130NV
Description  Synchronous Buck Converter with Integrated FET
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Manufacturer  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BD9130NV Datasheet(HTML) 11 Page - Rohm

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BD9130NV
TSZ02201-0J3J0AJ00130-1-2
© 2012 ROHM Co., Ltd. All rights reserved.
02.Oct.2014 Rev.002
www.rohm.com
TSZ22111・15・001
4. Switching Regulator Efficiency
Efficiency η 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(I2R)
where:
RCOIL is the DC resistance of inductor.
RON is the ON-Resistance of FET.
IOUT is the output current.
(2) Gate Charge/Discharge Dissipation: Pd(Gate)
where:
Cgs is the gate capacitance of FET.
f is the switching frequency.
V is the gate driving voltage of FET.
(3) Switching Dissipation: Pd(SW)
where:
CRSS is the reverse transfer capacitance of FET.
IDRIVE is the peak current of gate.
(4) ESR Dissipation of Capacitor: Pd(ESR)
where:
IRMS is the ripple current of capacitor.
ESR is the equivalent series resistance.
(5) Operating Current Dissipation of IC: Pd(IC)
where:
ICC is the circuit current.
 
%
100
100
100
Pd
P
P
P
P
I
V
I
V
OUT
OUT
IN
OUT
IN
IN
OUT
OUT
 
ON
COIL
OUT
R
R
I
R
I
Pd
2
2
 
DRIVE
OUT
RSS
IN
I
f
I
C
V
SW
Pd
2
ESR
I
ESR
Pd
RMS
2
 
CC
IN
I
V
IC
Pd
2
V
f
C
Gate
Pd
gs


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