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FSQ0365, FSQ0265, FSQ0165, FSQ321, FSQ311 — Green Mode Fairchild Power Switch (FPS™)

September 2007

FSQ0365, FSQ0265, FSQ0165, FSQ321, FSQ311 Green Mode Fairchild Power Switch (FPS™) for Valley Switching Converter - Low EMI and High Efficiency
„ Optimized for Valley Switching (VSC) „ Low EMI through Variable Frequency Control and

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 that is well suited for costeffective designs of valley switching fly-back converters.

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 „ Various 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 Start-up Circuit Internal High-Voltage SenseFET (650V) Built-in Soft-Start (15ms)

„ Power Supply for DVP Player and DVD Recorder,

Set-Top Box
„ Adapter „ Auxiliary Power Supply for PC, LCD TV, and PDP TV

Related Application Notes
„ AN-4137, AN-4141, AN-4147, AN-4150 (Flyback) „ AN-4134 (Forward)

FPSTM is a trademark of Fairchild Semiconductor Corporation.
© 2006 Fairchild Semiconductor Corporation FSQ0365, FSQ0265, FSQ0165, FSQ321, FSQ311 Rev. 1.0.5 www.fairchildsemi.com

Free Datasheet 

FSQ0365, FSQ0265, FSQ0165, FSQ321, FSQ311 — Green Mode Fairchild Power Switch (FPS™)

Ordering Information
Product Number(5) FSQ311 FSQ311L FSQ32

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