Green Mode Fairchild Power Switch (FPSTM)
Features
• Internal Avalanche Rugged Sense FET
• Precision Fixed Operating Frequency (67kHz)
• Advanced Burst-Mode operation Consumes under 0.2W
at 265Vac and no load
• Internal Start-up Switch and Soft Start
• Under Voltage Lock Out (UVLO) with Hysteresis
• Pulse by Pulse Current Limit
• Over Load Protection (OLP)
• Over Voltage Protection (OVP)
• Internal Thermal Shutdown Function (TSD)
• Secondary Side Regulation
• Auto-Restart Mode
Applications
• Charger & Adaptor for Mobile Phone, PDA & MP3
• Auxiliary Power for White Goods, PC, C-TV & Monitor
Description
The FSDM311 is an integrated Pulse Width Modulator
(PWM) and Sense FET specially designed for high performance
off-line Switch Mode Power Supplies (SMPS) with
minimal external components. This device is a monolithic
high voltage power switching regulator which combines an
VDMOS Sense FET with a voltage mode PWM control
block. The integrated PWM controller features include: a
fixed oscillator, Under Voltage Lock Out (UVLO) protection,
Leading Edge Blanking (LEB), optimized gate turn-on/
turn-off driver, thermal shut down protection (TSD), temperature
compensated precision current sources for loop compensation
and fault protection circuitry. When compared to a
discrete MOSFET and controller or RCC switching converter
solution, the FSDM311 reduces total component
count, design size, weight and at the same time increases
efficiency, productivity, and system reliability. This device is
a basic platform well suited for cost effective designs of flyback
converters.
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