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FSQ321L Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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FSQ321L Datasheet(HTML) 1 Page - Fairchild Semiconductor |
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1 / 24 page  © 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com September 2007 FSQ0365, FSQ0265, FSQ0165, FSQ321, FSQ311 Rev. 1.0.5 FPSTM is a trademark of Fairchild Semiconductor Corporation. FSQ0365, FSQ0265, FSQ0165, FSQ321, FSQ311 Green Mode Fairchild Power Switch (FPS™) for Valley Switching Converter - Low EMI and High Efficiency Features Optimized for Valley Switching (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 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) Applications 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) 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 that is well suited for cost- effective designs of valley switching fly-back converters. |
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