FSCM0565R Datasheet, PDF (13/20 Pages) Fairchild Semiconductor – Green Mode Fairchild Power Switch (FPS)

Typical application circuit
FSCM0565R
Application
LCD Monitor
Output power
40W
Input voltage
Universal input
(85-265Vac)
Output voltage (Max current)
5V (2.0A)
12V (2.5A)
Features
• High efficiency (>81% at 85Vac input)
• Low standby mode power consumption (<1W at 240Vac input and 0.4W load)
• Low component count
• Enhanced system reliability through various protection functions
• Low EMI through frequency modulation
• Internal soft-start (15ms)
Key Design Notes
• The delay time for over load protection is designed to be about 50ms with C106 of 47nF. If a faster triggering of OLP is
required, C106 can be reduced to 22nF.
• Using a resistor R106 on the current limit pin (#5), the pule-by-pulse current limit level is reduced to about 2A.
• Zener diode ZD102 is used for a safety test such as UL. When the drain pin and feedback pin are shorted, the zener diode
fails and remains short, which causes the fuse (F1) blown and prevents explosion of the opto-coupler (IC301). This zener
diode also increases the immunity against line surge.
1. Schematic
BD101
2
2KBP06M3N257
1
4
C102
220nF
275VAC
C103
100uF
400V
R103
56kΩ
2W
R102
500kΩ
C104
2.2nF
1kV
R105
D101 500kΩ
UF 4007
T1
D202
EER3016 ^MBRF10100
1
10
C201
1000uF
25V
2
8
3
FSCM0565RC
3
5
I_limit
Drain ¹
R106
10kΩ
1/4W
ZD102 ^C106
10V
47nF
50V
4 _Vfb
Vcc ³
GND
2 ZD101
22V
4
C105 ^D102 R104
22uF TVR10G 5Ω
50V
5
D201
MBRF1045
7
C203
1000uF
10V
6
L201
C202
1000uF
25V
L202
C204
1000uF
10V
LF101
23mH
R101
560kΩ
1W
RT1
5D-9
C101
220nF
275VAC
F1
FUSE
250V
2A
C301
4.7nF
R201
1kΩ
IC301
H11A817A
R202
1.2kΩ
IC201
KA431
R203
10kΩ
R204
5.6kΩ
C205
47nF
R205
5.6kΩ
12V, 2.5A
5V, 2A
13