APW34063 データシートの表示（PDF） - Anpec Electronics
部品番号
コンポーネント説明
メーカー
APW34063 Datasheet PDF : 13 Pages
| |||
APW34063
Design Formula Table
Calculation
ton / toff
ton + toff
toff
ton
CT
Ipk(switch)
Rsc
L(min)
CO
Set-Up
Vout + VF - Vin(min)
Vin(min) - Vsat
1
f
ton + toff
ton +1
toff
(ton + toff) - toff
4.0 x 10-5 ton
( ) 2Iout(max) ton +1
toff
0.3 / Ipk(switch)
( ) Vin(min) - VSat
Ipk(switch)
ton(m ax)
Ioutton
9 Vripple(pp)
Step-Down
Vout + VF
Vin(min) - Vsat - Vout
1
f
ton + toff
ton +1
toff
(ton + toff) - toff
4.0 x 10-5 ton
2Iout(max)
0.3 / Ipk(switch)
( ) Vin(min) - VSat - Vout
Ipk(switch)
ton(m ax)
Ipk(switch)(ton + toff)
8Vripple(pp)
Voltage-Inverting
IvoutI + VF
Vin - Vsat
1
f
ton + toff
ton +1
toff
(ton + toff) - toff
4.0 x 10-5 ton
( ) 2Iout(max) ton +1
toff
0.3 / Ipk(switch)
( ) V - V in(min)
Sat
I t pk(switch)
on(m ax)
Ioutton
9 Vripple(pp)
Vsat = Saturation voltage of the output switch.
VF = Forward voltage drop of the output rectifier.
The following power supply characteristics must be chosen :
Vin - Nominal input voltage.
Vout - Desired output voltage,
IVoutI
=
1.25
1 +
R2
Iout - Desired output current.
R1
fmin - Minimum desired output switching frequency at the selected values of Vin and Io.
Vripple(pp) - Desired peak-to-peak output ripple voltage. In practice, the calculated capacitor value will need
to be increased due to its equivalent series resistance and board layout. The ripple voltage should
be kept to a low value since it will directly affect the line and load regulation.
Copyright © ANPEC Electronics Corp.
8
Rev. A.3 - May., 2005
www.anpec.com.tw
Share Link: 