Fairchild FPS Series, Руководство по конструкции

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www.fairchildsemi.com/fps
FPS
™
Design Guide
5V
12V
85V-265VAC Input
Primary 36 turns
Vcc 8 turns
5V 3 turns
12V 7 turns
40W output
Lp = 520uH EER3016
Vfb
4
Vcc
3
GND
2
Drain
1
NC
5
Vstr
6
1 2
7
8
10
3
2
2
1
4
56
13
4
2
DB101
2KBP06 C103
100uF
400V
+
C205
47nF
50V
C201
1000uF
25V
+
R104
5R
L201
C102
220nF
275VAC
R101
560K/1W
D101
UF4007
LF101:23mH
C105
22uF
50V +
D102
1N4148
ZD101
22V
C101
220nF
275VAC
C204
1000uF
10V
+
R201
1K
R105
40K
1W
R102
40K
1W C104
100uF
400V R206
56K
2W
R202
1.2K
IC301
H11A817A
R204
5.6K
R205
5.6K
IC101
FSDM07652R
C203
1000uF
10V
+
L202
RT101
IC201
KA431
C202
1000uF
25V
+
CONN1
B2P3-VH
T1:EER 3016
C301
4.7nF
YCAP
-
+
F101
FUSE
C106
47nF
50V
D201
MBRF10100
D202
MBRF1045
R203
10K
This shows a higher power isolated flyback application, sharing the same features as many of the lower power applications. A
lower inductance value is used to ensure that the associated leakage inductance is also kept low in this application, remembering
that snubber losses are proportional to the leakage inductance and to the square of the current.
• FPS containing PWM IC with co-packaged MOSFET solution is very robust and improves system reliability
– Fully avalanche rated switch
– Over current protection for secondary diode short circuit
– Over voltage protection
• Current mode control gives excellent line and load regulation
– Better regulation
• Overload protection distinguishes between temporary and permanent overload
• Internal soft start reduces inrush current and output overshoot on turn on
Fairchild Devices Description
FSDM07652R Fairchild Power Switch (2.5A/70kHz)
H11A817A Optocoupler
KA431 2.5V Reference (2.5V)
1N4007 General Purpose Diode (1A/1000V)
1N4148 General Purpose Diode (10mA/100V)
KBP06M Bridge Rectifier Diode (1.5A/600V)
40W Isolated Flyback Power Supply
Typical Application – AC Input Industrial Control, LCD Monitor
Examples of Typical Application Circuits