Fairchild FPS FSQ510,FSQ510H, and FSQ510M Green Mode Power Switch Valley Switching Converter -- Low EMI & High Efficiency Data Manual
Summary
The FSQ510 series is a high-efficiency, low-EMI Power Switch (FPS™) designed for advanced Valley Switching Converters. This integrated LDMOS component offers superior performance in offline switch-mode power supplies by featuring variable frequency control and an integrated VS-PWM controller, eliminating the need for many external parts. The manual provides comprehensive technical details, including application circuits, internal block diagrams, and specifications for essential protections like UVLO, OLP, and soft-start. It is purpose-built for designers of auxiliary power supplies in large electronics, such as LCD TVs, monitors, personal computers, and white goods.
Page 1 Text Content
FSQ 510, FSQ 510H , and FSQ 510M reen M ode Fairchild Pow er Sw itch (FPS™ ) for Valley Sw itching C onverter
January 2009
FSQ510, FSQ510H, and FSQ510M Green Mode Fairchild Power Switch (FPS™) for Valley Switching Converter – Low EMI and High Efficiency Features Description
Uses an LDMOS Integrated Power Switch A Valley Switching Converter (VSC) generally shows lower EMI and higher power conversion efficiency than
Optimized for Valley Switching Converter (VSC)
a conventional hard-switched converter with a fixed switching frequency. The FSQ510 (H or M) is an
Low EMI through Variable Frequency Control and
integrated valley switching pulse width modulation (VS-
Inherent Frequency Modulation
PWM) controller and Sense FET specifically designed
High Efficiency through Minimum Drain Voltage for offline switch-mode power supplies (SMPS) for Switching valley switching with minimal external components. The
VS-PWM controller includes an integrated oscillator,
Extended Valley Switching for Wide Load Ranges
under-voltage lockout (UVLO), leading-edge blanking
Small Frequency Variation for Wide Load Ranges (LEB), optimized gate driver, internal soft-start,
temperature-compensated precise current sources for
Advanced Burst-Mode Operation for Low Standby
loop compensation, and self-protection circuitry.
Power Consumption
Compared with discrete MOSFET and PWM controller
Pulse-by-Pulse Current Limit
solutions, the FSQ510 (H or M) can reduce total cost,
Protection Functions: Overload Protection (OLP), component count, size and weight; while simultaneously Internal Thermal Shutdown (TSD) with Hysteresis increasing efficiency, productivity, and system reliability.
This device provides a platform for cost-effective designs
Under-Voltage Lockout (UVLO) with Hysteresis
of a valley switching flyback converters.
Internal Startup Circuit Internal High-Voltage Sense FET: 700V Built-in Soft-Start: 5ms Applications Auxiliary Power Supplies for LCD TV, LCD Monitor, Personal Computer, and White Goods
Ordering Information
Output Power Table (1)
Operating
Current RDS(ON) 230VAC ± 15%(2) 85-265VAC Part Replaces
Eco Junction
Number Package Limit (MAX) Devices
Open Open
Status Temperature
Adapter(3) Adapter(3)
Frame(4) Frame(4)
FSQ510 7-DIP FSD210B FSQ510H 8-DIP FSD210DH Ro HS -40 to +130°C 320m A 32Ω 5.5W 9W 4W 6W FSQ510M 7-MLSOP FSD210BM
For Fairchild’s definition of “green” Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html. Notes: 1. The junction temperature can limit the maximum output power. 2. 230VAC or 100/115VAC with voltage doubler. 3. 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. 4. Maximum practical continuous power for auxiliary power supplies in an open-frame design at 50°C ambient temperature.
© 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com FSQ510, FSQ510H, and FSQ510M • Rev. 1.3.0
Page Summary Contents For Fairchild FPS FSQ510,FSQ510H, and FSQ510M Green Mode Power Switch Valley Switching Converter -- Low EMI & High Efficiency Data Manual
Manual Details
| Brand | Fairchild |
|---|---|
| Pages | 15 |
| File Size | 724.49 KB |
| Published | July 07, 2026 |
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Frequently Asked Questions
What is the primary benefit of using a Valley Switching Converter (VSC) over conventional converters?
A VSC uses an LDMOS Integrated Power Switch, resulting in lower EMI and higher power conversion efficiency than hard-switched converters.
Which devices are offered for the Green Mode Fairchild Power Switch?
The available parts are FSQ510, FSQ510H, and FSQ510M.
What protective functions does this device include?
It includes Overload Protection (OLP), Under-Voltage Lockout (UVLO), Internal Thermal Shutdown (TSD) with Hysteresis, and continuous protection circuitry.