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PRELIMINARY DATASHEET
FSQ510, FSQ510H Green Mode Fairchild Power Switch (FPSTM) for Quasi-Resonant Converter
August 2006
FSQ510, FSQ510H — Green Mode Fairchild Power Switch (FPSTM) for Quasi-Resonant Converter – Low EMI and High Efficiency
Features Uses a DMOS Integrated Power Switch Optimized for Quasi-Resonant Converter (QRC) Low EMI through Variable Frequency Control and
Inherent Frequency Modulation
Applications Cell Phone Chargers Auxiliary Power Supplies for PC and White Goods Description
A Quasi-Resonant Converter (QRC) generally shows lower EMI and higher power conversion efficiency than a conventional hard-switched converter with a fixed switching frequency. The FSQ510(H) is an integrated Pulse-Width Modulation (PWM) controller and SenseFET specifically designed for quasi-resonant offline Switch Mode Power Supplies (SMPS) with minimal external components. The PWM controller includes an integrated fixed-frequency oscillator, Under-Voltage Lockout (UVLO), Leading Edge Blanking (LEB), optimized gate driver, internal soft start, temperaturecompensated precise current sources for loop compensation, and self-protection circuitry. Compared with discrete MOSFET and PWM controller solution, the FSQ510(H) can reduce 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 quasi-resonant switching flyback converters.
High Efficiency through Minimum Voltage Switching Extended Quasi-Resonant Switching for Wide Load
Ranges
Small Frequency Variation for Wide Load Ranges Advanced Burst-Mode Operation for Low Standby
Power Consumption
Pulse-by-Pulse Current Limit Various Protection Functions: Overload Protection Under-Voltage Lockout (UVLO) with Hysteresis Internal Start-up Circuit Internal High-Voltage SenseFET (700V) Built-in Soft Start (5ms)
(OLP), Abnormal Over-Current Protection (AOCP), Internal Thermal Shutdown (TSD) with Hysteresis
Ordering Information
Part Number FSQ510 Maximum Output Power (1) Operating PbCurrent RDS(ON) 230VAC ± 15%(2) 85-265VAC Package Temperature Free Limit (MAX) Open Open (3) (3) Range Adapter (4) Adapter (4) Frame Frame 7-DIP Yes -25℃ to +85℃ 320mA 5W 7W 4W 5W 32Ω Yes -25℃ to +85℃ 320mA 32Ω 5W 7W 4W 5W Replaces Devices FSD210B FSD210HD
FSQ510H 8-DIPH
Notes: 1. The junction temperature can limit the maximum output power. 2. 230VAC or 100/115VAC with doubler. 3. Typical continuous power in a non-ventilated enclosed adapter measured at 50°C ambient. 4. Maximum practical continuous power in an open-frame design at 50°C ambient temperature.
© 2006 Fairchild Semiconductor Corporation FSCQ510, FSCQ510H Rev. 0.0.3
www.fairchildsemi.com
PRELIMINARY DATASHEET
FSQ510, FSQ510H Green Mode Fairchild Power Switch (FPSTM) for Quasi-Resonant Converter
Application Circuit
Vo
AC IN VSTR D
PWM
Sync VFB GND
VCC
Figure .