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Fairchild Power Switch(FPS)
Description
The Fairchild Power Switch (FPS) product family is specially
designed for an off line SMPS with minimal external compo-
nents. The Fairchild Power Switch (FPS) consists of high volt-
age power SenseFET and current mode PWM controller. The
PWM controller includes integrated fixed oscillator, under volt-
age lock out, leading edge blanking block, optimized gate turn-
on/turn-off driver, thermal shut down protection, over voltage
protection, temperature compensated precise current sources for
loop compensation and fault protection circuit. Compared to
discrete MOSFET and PWM controller or ring choke converter
(RCC) solutions, the Fairchild Power Switch (FPS) can reduce
total cost, component count, size and weight simultaneously
increasing efficiency, productivity, and system reliability. It has
simple applications well suited for cost down design for flyback
converter or forward converter.
TO-3P-5L
Precise Fixed Operating Frequency
FS7M0680(66kHz)
Pulse By Pulse Current Limiting
Over Current Protection
Over Load Protection
Over Voltage Protection (Min. 25V)
Internal Thermal Shutdown Function
Under Voltage Lockout with Hysteresis
Internal High Voltage Sense FET
Latch Up Mode
Soft Start
1
1. DRAIN 2. GND 3. V
CC
4. FB 5. S/S
Internal Block Diagram
#5
S o ft S ta rt
#3
Vcc
UVLO
Internal
Vias
O SC
PW M
Com parator
-
+
-
#1
D R AIN
Vref
S
R
Q
Ron
R o ff
#4
Feedback
Ifb
Vref
Vref
3R
R
+
Vfb
offset
S
V cc
R eset
Idelay
Q
D elay
12 0ns
+
-
Vsd
Vcc
Vovp
R
Vo cp
R sense
Therm al
S hutdo w n
#2
S o urce
GND
Rev.1.0.0
漏2003 Fairchild Semiconductor Corporation