Fairchild FSQ0465RS RB- Green-Mode Power Switch (FPM) - Quasi-Resonant Operation - Low EMI and High Efficiency Data Sheet
Summary
Fairchild FSQ0465RS/RB Green-Mode Power Switch integrating PWM controller and 650V SenseFET MOSFET for quasi-resonant flyback converters. Features variable frequency AVS control, burst-mode low standby power, and protection against overload, over-voltage, over-current, and thermal shutdown. For power supply designers building efficient offline converters for consumer electronics.
Page 1 Text Content
FSQ 0465R S/R reen-M ode Farichild Pow er Sw itch (FPS ) for Q uasi-R esonant O peration
December 2009
FSQ0465RS/RB Green-Mode Fairchild Power Switch (FPS) for Quasi-Resonant Operation - Low EMI and High Efficiency Features Description Optimized for Quasi-Resonant Converters (QRC) A Quasi-Resonant Converter (QRC) generally shows
Low EMI through Variable Frequency Control and AVS lower EMI and higher power conversion efficiency than a
(Alternating Valley Switching) conventional hard-switched converter with a fixed
High-Efficiency through Minimum Voltage Switching switching frequency. The FSQ-series is an integrated Narrow Frequency Variation Range over Wide Load Pulse-Width Modulation (PWM) controller and and Input Voltage Variation Sense FET specifically designed for quasi-resonant Advanced Burst-Mode Operation for Low Standby operation and Alternating Valley Switching (AVS). The Power Consumption PWM controller includes an integrated fixed-frequency Simple Scheme for Sync Voltage Detection oscillator, Under-Voltage Lockout (UVLO), Leading- Edge Blanking (LEB), optimized gate driver, internal soft-
Pulse-by-Pulse Current Limit
start, temperature-compensated precise current sources
Various Protection Functions: Overload Protection
for a loop compensation, and self-protection circuitry.
(OLP), Over-Voltage Protection (OVP), Abnormal
Over-Current Protection (AOCP), Internal Thermal Compared with a discrete MOSFET and PWM controller Shutdown (TSD) with Hysteresis, Output Short solution, the FSQ-series can reduce total cost,
Protection (OSP) component count, size, and weight; while simultaneously
Under-Voltage Lockout (UVLO) with Hysteresis increasing efficiency, productivity, and system reliability. Internal Startup Circuit This device provides a basic platform for cost-effective designs of quasi-resonant switching flyback converters.
Internal High-Voltage Sense FET (650V) Built-in Soft-Start (17.5ms)
Applications Power Supply for LCD TV and Monitor, VCR, SVR, STB, and DVD & DVD Recorder Adapter Related Resources Visit: http://www.fairchildsemi.com/apnotes/ for: AN-4134: Design Guidelines for Offline Forward Converters Using Fairchild Power Switch (FPS) AN-4137: Design Guidelines for Offline Flyback Converters Using Fairchild Power Switch (FPS) AN-4140: Transformer Design Consideration for Offline Flyback Converters Using Fairchild Power Switch (FPS) AN-4141: Troubleshooting and Design Tips for Fairchild Power Switch (FPS) Flyback Applications AN-4145: Electromagnetic Compatibility for Power Converters AN-4147: Design Guidelines for RCD Snubber of Flyback Converters AN-4148: Audible Noise Reduction Techniques for Fairchild Power Switch (FPS) Applications AN-4150: Design Guidelines for Flyback Converters Using FSQ-Series Fairchild Power Switch (FPS)
© 2 008 Fairchild Semiconductor Corporation www.fairchildsemi.com FSQ 0465RS/RB Rev. 1.0.1
Page Summary Contents For Fairchild FSQ0465RS RB- Green-Mode Power Switch (FPM) - Quasi-Resonant Operation - Low EMI and High Efficiency Data Sheet
Manual Details
| Brand | Fairchild |
|---|---|
| Pages | 23 |
| File Size | 3.08 MB |
| Published | June 17, 2026 |
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Frequently Asked Questions
What is the max output power for FSQ0465RS in an open-frame design?
It delivers 70W at 230V AC and 48W at 85-265V AC.
Which protection features does the FSQ0465RS/RB include?
It has OLP, OVP, AOCP, TSD with hysteresis, and OSP.
What are typical applications for the FSQ0465RS/RB?
Power supplies for LCD TVs, monitors, VCRs, STBs, DVD players, and adapters.
What is the built-in soft-start time of this device?
The built-in soft-start time is 17.5ms.