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FSQ0365

Green Mode Fairchild Power Switch (FPS™) for Valley Switching Converter – Low EMI and High Efficiency

Fairchild Semiconductor 

August 2011

FSQ0365, FSQ0265, FSQ0165, FSQ321

Green Mode Fairchild Power Switch (FPS™)

for Valley Switching Converter – Low EMI and High Efficiency

Features

 Optimized for Valley Switching Converter (VSC)

 Low EMI through Variable Frequency Control and

Inherent Frequency Modulation

 High Efficiency through Minimum Voltage Switching

 Narrow Frequency Variation Range Over Wide Load

and Input Voltage Variation

 Advanced Burst-Mode Operation for Low Standby

Power Consumption

 Pulse-by-Pulse Current Limit

 Protection Functions: Overload Protection (OLP),

Over-Voltage Protection (OVP), Abnormal Over-

Current Protection (AOCP), Internal Thermal

Shutdown (TSD)

 Under-Voltage Lockout (UVLO) with Hysteresis

 Internal Startup Circuit

 Internal High-Voltage SenseFET: 650V

 Built-in Soft-Start: 15ms

Applications

 Power Supplies for DVP Player, DVD Recorder,

Set-Top Box

 Adapter

 Auxiliary Power Supply for PC, LCD TV, and PDP TV

Description

A Valley Switching Converter generally shows lower EMI

and higher power conversion efficiency than a

conventional hard-switched converter with a fixed

switching frequency. The FSQ-series is an integrated

Pulse-Width Modulation (PWM) controller and

SenseFET specifically designed for valley switching

operation with minimal external components. The PWM

controller includes an integrated fixed-frequency

oscillator, under-voltage lockout, Leading-Edge Blanking

(LEB), optimized gate driver, internal soft-start,

temperature-compensated precise current sources for

loop compensation, and self-protection circuitry.

Compared with discrete MOSFET and PWM controller

solutions, the FSQ-series reduces total cost, component

count, size and weight; while simultaneously increasing

efficiency, productivity, and system reliability. This

device provides a basic platform for cost-effective

designs of valley switching fly-back converters.

Related Application Notes

 AN-4137 - Design Guidelines for Offline Flyback

Converters Using Fairchild Power Switch (FPS™)

 AN-4141 - Troubleshooting and Design Tips for

Fairchild Power Switch (FPS™) Flyback

Applications

 AN-4147 - Design Guidelines for RCD Snubber of

Flyback Converters

 AN-4150 - Design Guidelines for Flyback

Converters Using FSQ-series Fairchild Power

Switch (FPS™)

 AN-4134 - Design Guidelines for Off-line Forward

Converters Using Fairchild Power Switch (FPS™)

© 2007 Fairchild Semiconductor Corporation

FSQ0365, FSQ0265, FSQ0165, FSQ321 • Rev. 1.0.6

www.fairchildsemi.com

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