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参数资料
| 型号： | PJ3463CD |
| 元件分类： | 稳压器 |
| 英文描述： | 1.5 A SWITCHING REGULATOR, 100 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封装： | DIP-8 |
| 文件页数： | 4/5页 |
| 文件大小： | 238K |
| 代理商： | PJ3463CD |
PJ3463
DC-To-DC Converter Controller
4-5
2003/01.ver.A
FIGURE 5.VOLTAGE INVERTING CONVERTER
Table : Design Formula
Calculation
Step-Up
Step-Down
Voltage-Inverting
ton
toff
Vout+VF -Vin(min)
VCC(min)-Vsat
VOUT+VF
VCC-Vsat-VOUT
│
Vout│ +VF
VCC + Vsat
(ton+toff) max
min
1
f
min
1
f
min
1
f
CT
4.0×10-5 ton
Ipk(switch)
2Iout(max)
+1
toff
ton
2Iout(max)
+1
toff
ton
Rsc
0.3/IPK(switch)
L (min)
(max)
)
(
(min)
ton
switch
Ipk
Vsat
Vin
(max)
)
(
(min)
ton
switch
Ipk
Vout
Vsat
Vin
(max)
)
(
(min)
ton
switch
Ipk
Vsat
Vin
Co
)
( pp
Vripple
Ioutton
+
)
(
8
)
)(
(
pp
Vripple
toff
ton
switch
Ipk
)
( pp
Vripple
Ioutton
TERMS AND DEFINITIONS
Vsat = Saturation Voltage of the output switch.
VF = Forward Voltage drop of the rectifier.
The following power supply characteristics must be chosen:
Vin= Normal input voltage
Vout: Desied Output voltage, |Vout|=1.25 (1+
1
2
R
)
Iout : Desired output current.
fmin : Minimum desired output switching frequency at the selected values for Vin and.Io.
Vripple(p-p): Desired peak-to-peak output ripple voltage. in practice, the calculated capaitor value will need to be increased
due to its equivalent series resistance and board layout.
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