Service manual

Preliminary Specification
©2002 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev.0.9.1
Features
• Single Chip 700V SenseFET Power Switch
• Precision Fixed Operating Frequency (134kHz)
• Internal Start-up Switch
• UVLO with Hysteresis (6V/7V)
• Over Load Protection
• Over Current Protection
• Internal Thermal Shutdown Function (Hysteresis)
• Secondary Side Regulation
• Auto-Restart Mode
• Frequency Modulation for EMI
• No Bias Winding
Applications
• Charger & Adaptor for Mobile Phone, PDA & MP3
• Auxiliary Power for PC, C-TV & Monitor
Description
The FSD20x is specially designed for an off-line SMPS with
minimal external components. The FSD20x is a monolithic
high voltage power switching regulator that combine the
SenseFET(LDMOS) with voltage mode PWM control block.
Included PWM controller features integrated fixed oscillator
with frequency scaling, under voltage lock out, leading edge
blanking, optimized gate turn-on/turn-off driver, thermal shut
down 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 FSD20x can reduce total
component count, design size, weight and at the same time
increase efficiency, productivity, and system reliability. It has a
basic platform well suited for cost effective design in a flyback
converter.
1.2.3.GND 4.Vfb 5.Vcc 7.Drain 8.Vstr
7-DIP
7-SMD
Internal Block Diagram
Rsense
Iover
S/S
3mS
7V
8
4
1, 2, 3
7
5
OSC
S
R
Q
℃
TSD
His 50
S
R
Q
LEB
OLP
Reset
UVLO
Voltage
Ref.
/ 8
DRIVER
Frequency
Scaling
5uA 250uA
ON/
OFF
Vck
Vth
SFET
Vstr
Drain
GND
Vfb
Vcc
HV/REG
Internal
Bias
FSD20x-SERIES
FSD200, FSD201
Fairchild Power Switch(FPS)
95