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Wide Operating Frequency Range up to 150KHz
Internal Burst Mode Controller for Stand-by Mode
Pulse by Pulse Over Current Limiting
Over Current Protection(Auto Restart Mode)
Over Voltage Protection (Auto Restart Mode)
Over Load Protection(Auto Restart Mode)
Internal Thermal Shutdown Function(Auto Restart Mode)
Under Voltage Lockout
Internal High Voltage SenseFET
Internal Sync Terminal/Soft Start
Description
The Fairchild Power Switch(FPS) product family is specially
designed for an off line SMPS with minimal external
components. The Fairchild Power Switch(FPS) consist of
high voltage power SenseFET and current mode PWM IC.
Included PWM controller features integrated fixed oscillator,
under voltage lock out, optimized gate turn on/turn off driver,
thermal shutdown protection, over voltage protection, and
temperature compensated precision current sources for loop
compensation and fault protection circuitry. Compared to
discrete MOSFET and controller or RCC switching converter
solution, a Fairchild Power Switch(FPS) can reduce 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 cost effective monitor
power supply.
TO-220-5L
1
1. Drain 2. GND 3. V
CC
4. Feedback 5. Soft Start & Sync.
Internal Block Diagram
Vcc
SoftStart
& Sync
Vref
Drain
3
Vpp=5.8/7.2V
OSC
Internal
Bias
Vref
Vfb
Vth=1V
Burst mode
controller
Vref
UVLO
1
5
S
Q
Ron
Vcc
Vth=11V/12V
R
Roff
Feedback
PWM
4
Ifb
2.5R
R
Vcc
Vfb Offset
Rsenese
Vref
Idelay
OLP
Vth=7.5V
Vcc
Vth=30V
OVP
OCL
Filter
(130nsec)
TS
D
Vth=1V
2
GND
S
UVLO Reset
(Vcc=9V)
Q
(Tj=160鈩?
R
Rev.1.0.0
漏2002 Fairchild Semiconductor Corporation