FAN7602B Просмотр технического описания (PDF) - Fairchild Semiconductor
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FAN7602B Datasheet PDF : 17 Pages
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Typical Application Circuit
Application
Adapter
Output Power
48W
Input Voltage
Universal input (85~265VAC)
Output Voltage
12V
Features
Low stand-by power (<0.3W at 265VAC)
Constant output power control
Key Design Notes
All the IC-related components should be placed close to IC, especially C107 and C110.
If R106 value is too low, there can be subharmonic oscillation.
R109 should be designed carefully to make VCC voltage higher than 8V when the input voltage is 265VAC at no load.
R110 should be designed carefully to make VCC voltage lower than OVP when the input voltage is 85VAC at full load.
R103 should be designed to keep the MOSFET VDS voltage lower than maximum rating when the output is shorted.
1. Schematic
R206 C204
D202
BD101
C103 C104
C102
R101
C101
FUSE
AC INPUT
1 T1 12
D204
L201
C105
R112
R113
C110
R107
C107
R114
D101
3
Q101
R105
R102
1 LUVP
2 Latch/
Plimit
3 CS/FB
4 GND
VSTR 8
7
NC
VCC 6
5
Out
IC101
R104
D103
C201
9
6 D102 R109 R110
C109
5
ZD101
OP1
4
1
3
2
C222
R202
R203 C203
3
IC201
1
R111
2
C202
R204
R205
R108
OP2
4
1
3
2
C108
R207
ZD201
Figure 25. Schematic
© 2007 Fairchild Semiconductor Corporation
FAN7602B Rev. 1.0.0
11
www.fairchildsemi.com
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