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FS8S0765RCTU Datasheet

  • FS8S0765RCTU

  • SMPS Controller

  • 19頁

  • ETC

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www.fairchildsemi.com
FS8S0765RC
Features
Fairchild Power Switch(FPS)
Description
The Fairchild Power Switch(FPS) product family are spe-
cially designed for an off-line SMPS with minimal external
components. The Fairchild Power Switch(FPS) consists of a
high voltage power SenseFET and a current mode PWM IC.
Included PWM controller features the integrated oscillator to
be synchronized with the external sync, the under voltage
lockout, the optimized gate turn on/turn off driver, the ther-
mal shutdown protection, the over voltage protection, and
the temperature compensated precision current sources for
the loop compensation and the fault protection circuitry.
Compared with a discrete MOSFET and a controller or a
RCC switching converter solution, the 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 monitor power supply.
TO-220-5L
鈥?Primary side regulation
鈥?External sync terminal/Soft start
鈥?Burst mode operation to reduce the power loss at the
standby mode
鈥?Reference voltage changed by external sync and Vfb
鈥?Wide operating frequency range up to 150KHz
鈥?Pulse by pulse over current limiting
鈥?Low start-up current (Max:80uA)
鈥?Low operating current (Max:15mA)
鈥?Over voltage protection (Auto restart mode)
鈥?Over load protection (Auto restart mode)
鈥?Over current protection (Auto restart mode)
鈥?Internal thermal shutdown (Auto restart mode)
鈥?Under voltage lockout
鈥?Internal high voltage SenseFET
Application
鈥?Monitor SMPS
1
1. Drain 2. GND 3. V
CC
4. Feedback 5. Sync
Internal Block Diagram
Vcc
Vref
Burst mode
detector
(Vfb<0.8V&
Vss>3V&
No Sync)
Vref
Internal
bias
Drain
3
0.5mS
delay
Burst mode
controller
1
Soft Start &
Sync
5
UVLO
Vbias
Ron
OSC
Roff
Feedback
4
Ifb
Vref
Vcc
PWM
2.5R
R
Vref
S Q'
R
Vfb Offset
Idelay
OLP
Vth=7.5V
Vcc
Vth=30V
OVP
UVLO Reset
(Vcc=9V)
OCL
Filter
(120nsec)
Rsenese
Vth=1V
2
GND
S
R
Q
TSD
(Tj=160鈩?
Rev.1.0.0
漏2002 Fairchild Semiconductor Corporation

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