Fairchild FSQ500N Green Mode Power Switch - Fairchild FPS Data Handbook
Summary
The FSQ500N is a high-efficiency, compact single-chip SenseFET power switch that integrates advanced PWM control for cost-effective flyback converters. Engineered for reliability and small size, it provides robust protections—including UVLO, OLP, and TSD—while simplifying design by eliminating the need for auxiliary bias windings. This manual serves as a comprehensive guide for engineers designing set-top boxes (STB), DSL equipment, and home appliance power supplies, covering wiring diagrams, operating characteristics, and full technical specifications.
Page 1 Text Content
FSQ 500N reen M ode Fairchild Pow er Sw itch (FPS™
October 2009
FSQ500N Green Mode Fairchild Power Switch (FPS™)
Features Description
The FSQ500N is specially designed for low cost, small
Single-Chip 700V Sense FET Power Switch
set-top box, DSL, home appliance auxiliary power Precision Fixed Operating Frequency: 130k Hz supplies. This device combines a current-mode Pulse Width Modulator (PWM) with a Sense FET. The
No-Load Consumption 250m W at 265VAC with integrated PWM controller features include: a fixed Burst Mode oscillator, Under-Voltage Lockout (UVLO) protection,
Overload Protection (OLP), Leading-Edge Blanking
Internal Startup Switch
(LEB), an optimized gate turn-on/turn-off driver, Thermal Shutdown (TSD) protection with hysteresis,
Soft-Start Time Tuned by External Capacitor
and temperature-compensated precision-current Under-Voltage Lockout (UVLO) with Hysteresis sources for loop compensation. When compared to a linear power supply, the FSQ500N reduces total size
Pulse-by-Pulse Current Limit and weight, while increasing efficiency, productivity, and
system reliability. This device provides a basic platform
Overload Protection (OLP) and Internal Thermal
for cost-effective flyback converters.
Shutdown Function (TSD) with Hysteresis Auto-Restart Mode No Need for Auxiliary Bias Winding
Applications STB and DSL Power Supply
Maximum Output Power(1)
Home Appliance, IH Cooker, Auxiliary Power
Supply 230VAC ± 15%(2) 85-265VAC
Adapter(3) Open
Related Resources Frame(4) Adapter(3) Open Frame(4)
AN-4137-Design Guidelines for Off-line Flyback Converters using FPS Notes:
1. The junction temperature can limit the maximum
AN-4141-Troubleshooting and Design Tips for
output power.
Fairchild Power Switch (FPStm) Flyback
2. 230VAC or 100/115VAC with doubler.
Applications
3. Typical continuous power in a non-ventilated AN-4147-Design Guidelines for RCD Snubber of enclosed adapter measured at 50°C ambient. Flyback 4. Maximum practical continuous power in an open frame design at 50°C ambient.
AN6075- (Flyback) -AN-6075-Compact Green- Mode Adapter Using FSQ500L for Low Cost
Ordering Information
Part Number Operating Package Packing
Temperature Range Status Method
FSQ500N -40°C to +85°C Ro HS 8-Lead, Molded Dual Inline Package
(MDIP), JEDEC MS-001, .300 Inch Wide Rail
For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com FSQ500N • Rev. 1.0.0
Page Summary Contents For Fairchild FSQ500N Green Mode Power Switch - Fairchild FPS Data Handbook
Manual Details
| Brand | Fairchild |
|---|---|
| Pages | 12 |
| File Size | 827.97 KB |
| Published | June 05, 2026 |
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