2002 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev.1.0.0
Features
Wide Operating Frequency Range Up to 150Khz
Lowest Cost SMPS Solution
Lowest External Components
Low Start up Current (max:170uA)
Low Operating Current (max:15mA)
Internal High Voltage SenseFET
Built-in Auto Restart Circuit
Over Voltage Protection (Auto Restart Mode)
Over Load Protection (Auto Restart Mode)
Over Current Protection (Auto Restart Mode)
Internal Thermal Protection (Auto Restart Mode)
Pulse By Pulse Over Current Limiting
Internal Burst Mode Controller for Stand-by Mode
Under Voltage Lockout With Hysteresis
External Sync. Terminal
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 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 monitor
power supply.
TO-3P-5L
1. Drain 2. Gnd 3. V
CC
4. FeedBack 5. Sync.
1
Internal Block Diagram
S
R
Q
S
R
Q
TS
(Tj=160
℃
)
Ifb
1
3
5
4
2
Vref
Rsenese
2.5R
R
Vref
Internal
Bias
Vref
UVLO
Ron
Roff
PWM
OCL
Burst mode
controller
Filter
(130nsec)
UVLO Reset
(Vcc=9V)
OLP
OVP
Vth=7.5V
Vcc
Vth=30V
Vth=1V
Vfb Offset
Idelay
Vcc
Vfb
Vth=1V
Vcc
Vth=11V/12V
OSC
Vref
Vpp=5.8/7.2V
Drain
Vcc
SoftStart
& Sync
Feedback
GND
FS 6S 1265RE
Fairchild Power S witch(FPS)