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FSDM101
Green Mode Fairchild Power Switch (FPSTM)
Features Internal Avalanche Rugged Sense FET Precision Fixed Operating Frequency (67kHz) 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 SMPS for VCR, SVR, STB, DVD, and DVCD Adaptor for Camcorder
Description The FSDM101 is an integrated Pulse Width Modulator
(PWM) and Sense FET specially designed for high perfor-
mance off-line Switch Mode Power Supplies (SMPS) with
minimal external components. This device is a monolithic
high voltage power switching regulator which combines a
VDMOS Sense FET with a voltage mode PWM control
block. The integrated PWM controller features include: a
fixed oscillator, Under Voltage Lock Out (UVLO) protec-
tion, Leading Edge Blanking (LEB), optimized gate turn-on/
turn-off driver, thermal shut down protection (TSD), temper-
ature compensated precision current sources for loop com-
pensation and fault protection circuitry. When compared to a
discrete MOSFET and controller or RCC switching con-
verter solution, the FSDM101 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 fly-
back converters.
Table 1. Notes: 1. Maximum practical continuous power
in an open frame design with a sufficient drain pattern as a heat sinker at 50°C ambient temperature. 2. 230 VAC or
100/115 VAC with doubler. 3. Peak output power means the maximum power can be handled instantaneously.
Typical Circuit
Figure 1. Typical Flyback Application Using FSDM101
