FSCQ-SERIES
FSCQ1265RT Typical Application Circuit
Application
Output Power
Input Voltage
Output Voltage (Max Current)
8.5V (0.5A)
15V (0.5A)
140V (0.6A)
24V (1.5A)
Universal input
(90-270Vac)
C-TV
132W
Features
• High Efficiency (>83% at 90Vac Input)
• Wider Load Range through the Extended Quasi-Resonant Operation
• Low Standby Mode Power Consumption (<1W)
• Low Component Count
• Enhanced System Reliability Through Various Protection Functions
• Internal Soft-Start (20ms)
Key Design Notes
• 24V output is designed to drop to around 8V in standby mode
1. Schematic
T1
D205
EER4042
EGP20D
15V, 0.5A
8.5V, 0.5A
140V, 0.6A
24V, 1.5A
10
RT101
5D-11
1
3
C204
1000uF
35V
C210
470pF
1kV
11
C102
330uF
400V
D204
EGP20D
BEAD101
R102
150kΩ
0.25W
4
13
12
R101
100kΩ
0.25W
C205
1000uF
35V
C107
1nF
1kV
BD101
C209
470pF
1kV
R106 C104
1kΩ 10uF
1W 50V
D105
1N4937
1
Drain
D202
EGP30J
SYNC
3
Vcc
5
IC101
FSCQ1265RT
ZD102
18V
1W
6
R104
1.5kΩ
0.25W
R103
5.1Ω
0.25W
D106
14
15
D103
1N4937
L202
BEAD
C202
68uF
160V
GND FB
C201
150uF
160V
1N4148
C207
470pF
1kV
2
4
16
C105
3.3nF
50V
C103
10uF
50V
R105
470Ω
0.25W
C106
47nF
50V
D203
EGP30D
17
18
7
C203
1000uF
35V
C208
470pF
1kV
LF101
VR201
30kΩ
R201
1kΩ
0.25W
OPTO101
FOD817A
ZD201
5.1V
0.5W
R208
1kΩ
R202
1kΩ
0.25W
R203
39kΩ
0.25W
C101
330nF
275VAC
C206
150nF
50V
R205
240kΩ D201
0.25W 1N4148
SW201
R207
5.1kΩ
FUSE
250V
5.0A
0.25W
0.25W
C301
3.3nF
Q202
KSC945
Q201
KA431
LZ
R204
4.7kΩ
0.25W
R206
10kΩ
0.25W
29
FAIRCHILD [ FAIRCHILD SEMICONDUCTOR ]
