FSQ510, FSQ510H, and FSQ510M
Green Mode Fairchild Power Switch (FPS™)
for Valley Switching Converter – Low EMI and High Efficiency
Uses an LDMOS Integrated Power Switch
Optimized for Valley Switching Converter (VSC)
Low EMI through Variable Frequency Control and
Inherent Frequency Modulation
High Efficiency through Minimum Drain Voltage
Extended Valley Switching for Wide Load Ranges
Small Frequency Variation for Wide Load Ranges
Advanced Burst-Mode Operation for Low Standby
Pulse-by-Pulse Current Limit
Protection Functions: Overload Protection (OLP),
Internal Thermal Shutdown (TSD) with Hysteresis
Under-Voltage Lockout (UVLO) with Hysteresis
Internal Startup Circuit
Internal High-Voltage SenseFET: 700V
Built-in Soft-Start: 5ms
Auxiliary Power Supplies for LCD TV, LCD Monitor,
Personal Computer, and White Goods
RoHS -40 to +130°C 320mA
For Fairchild’s definition of “green” Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
The junction temperature can limit the maximum output power.
with voltage doubler.
Typical continuous power with a Fairchild charger evaluation board described in this datasheet in a non-
ventilated, enclosed adapter housing, measured at 50°C ambient temperature.
Maximum practical continuous power for auxiliary power supplies in an open-frame design at 50°C ambient temperature.
© 2009 Fairchild Semiconductor Corporation
FSQ510, FSQ510H, and FSQ510M • Rev. 1.3.0
A Valley Switching Converter (VSC) generally shows
lower EMI and higher power conversion efficiency than
a conventional hard-switched converter with a fixed
switching frequency. The FSQ510 (H or M) is an
integrated valley switching pulse width modulation (VS-
PWM) controller and SenseFET specifically designed
for offline switch-mode power supplies (SMPS) for
valley switching with minimal external components. The
VS-PWM controller includes an integrated oscillator,
under-voltage lockout (UVLO), leading-edge blanking
temperature-compensated precise current sources for
loop compensation, and self-protection circuitry.
Compared with discrete MOSFET and PWM controller
solutions, the FSQ510 (H or M) can reduce total cost,
component count, size and weight; while simultaneously
increasing efficiency, productivity, and system reliability.
This device provides a platform for cost-effective designs
of a valley switching flyback converters.
Output Power Table