©2003 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev.1.0.0
Features
• Single Chip 700V SenseFET Power Switch
• Precision Fixed Operating Frequency (134kHz)
• Internal Start-up Switch and Soft Start
• UVLO with Hysteresis (6V/7V)
• Pulse by Pulse Current Limit
• Over Load 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 FSD200 is specially designed for an off-line SMPS with
minimal external components. The FSD200 is a monolithic
high voltage power switching regulator that combines an
LDMOS SenseFET with a voltage mode PWM control
block. The integrated PWM controller features: A fixed
oscillator with frequency modulation for reduced EMI.
Under voltage lock out. Leading edge blanking(LEB).
Optimized gate turn-on/turn-off driver. Thermal shut down
protection. Temperature compensated precision current
sources for loop compensation and fault protection circuitry.
Compared to a discrete MOSFET and controller or RCC
switching converter solution, an FSD200 can reduce total
component count, design size, weight and at the same time
increase efficiency, productivity, and system reliability. It is
a basic platform well suited for cost effective design of fly-
back converters.
1.2.3.GND 4.Vfb 5.Vcc 7.Drain 8.Vstr
7-DIP
Internal Block Diagram
Rsense
Iover
S/S
3mS
4
1, 2, 3
7
OSC
S
R
Q
TSD
His 50
S
R
Q
LEB
OLP
Reset
UVLO Reset
(Vcc<6V)
DRIVER
Frequency
Modulation
5uA
250uA
Vck
Vth
SFET
Drain
GND
Vfb
BURST
V
SD
V
BURST
7V
1
7
UVLO
Voltage
Ref.
HV/REG
INTERNAL
BIAS
ON/OFF
Vstr
Vcc
FSD200
Fairchild Power Switch(FPS)
