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Fixed Frequency
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(Latch Mode)
Under Voltage Lockout
Internal High Voltage Sense FET
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, leading edge blanking, optimized gate
turn-on/turn-off driver, thermal shut down protection, over
voltage protection, and temperature compensated precision
current sources for loop compensation and fault protection
circuitry. compared to discrete MOSFET and controller or
R
CC
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 LCD monitor power supply.
TO-220F-5L
1
1. Drain 2. GND 3. V
CC
4. Feedback 5. SoftStart
Internal Block Diagram
V
CC
Drain
3
Vref
OSC
Vref
Vfb
Vth=1V
Burst mode
controller
1
SoftStart
5
Internal
Bias
Vref
UVLO
S
Q
Ron
Vcc
Vth=11V/12V
R
Roff
PWM
Feedbock
4
Ifb
2.5R
R
Vcc
Vfb Offset
Rsenese
Vref
Idelay
OLP
Vth=7.5V
Vcc
Vth=33V
OVP
OCL
Filter
(130nsec)
TSD
Vth=2V
2
GND
S
UVLO Reset
(Vcc=9V)
Q
Q
S
R
Power-on
Reset
(Vcc=6.5V)
(Tj=160
鈩?
R
Rev.1.0.2
漏2002 Fairchild Semiconductor Corporation