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KA5L0565R
TM
Fairchild Power Switch(FPS )
Features Description
Precision Fixed Operating Frequency (50kHz) The Fairchild Power Switch(FPS) product family is specially
Low Start-up Current(Typ. 100uA) designed for an off-line SMPS with minimal external
Pulse by Pulse Current Limiting components. The Fairchild Power Switch(FPS) consists of a
Over Current Protection high voltage power SenseFET and a current mode PWM IC.
Over Voltage Protection (Min. 25V) Included PWM controller integrates the fixed frequency
Internal Thermal Shutdown Function oscillator, the under voltage lock-out, the leading edge
Under Voltage Lockout blanking, the optimized gate turn-on/turn-off driver, the
Internal High Voltage Sense FET thermal shutdown protection, the over voltage protection,
Auto-Restart Mode and the temperature compensated precision current sources
for the loop compensation and the fault protection circuitry.
Compared to a discrete MOSFET and a PWM controller or
an RCCsolution, a Fairchild Power Switch(FPS) can reduce
the total component count, design size and weight and at the
same time increase efficiency, productivity, and system
reliability. It has a basic platform well suited for the cost
effective design in a flyback converter.
TO-220F-4L
1
1. GND 2. DRAIN 3. V 4. FB
CC
Internal Block Diagram
#3 V
CC
#2 DRAIN
32V
5V Internal
Vref bias SFET
Good
logic
OSC
9V S
Q
5A
1mA
R
#4 FB
L.E.B
2.5R
+
1R
0.1V
+
S #1 GND
7.5V
Q
R
+ Thermal S/D
Power on reset
27V
OVER VOLTAGE S/D
Rev.1.0.0
2004 Fairchild Semiconductor Corporation