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Fairchild Semiconductor
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FSQ0170RNA, FSQ0270RNA — Green Mode Fairchild Power Switch (FPS™)

FSQ0170RNA, FSQ0270RNA Green Mode Fairchild Power Switch (FPS™)

October 2011

 Internal Avalanche Rugged 700V SenseFET  Consumes only 0.8W at 230 VAC & 0.5W Load with
Burst-Mode Operation  Precision Fixed Operating Frequency, 100kHz  Internal Start-up Circuit and Built-in Soft-Start  Pulse-by-Pulse Current Limiting and Auto-Restart
Mode  Over-Voltage Protection (OVP), Overload Protection
(OLP), Internal Thermal Shutdown Function (TSD)  Under-Voltage Lockout (UVLO)  Low Operating Current (3mA)  Adjustable Peak Current Limit
 Auxiliary Power Supply for PC and Server  SMPS for VCR, SVR, STB, DVD & DVCD Player,
Printer, Facsimile & Scanner  Adapter for Camcorder

The FSQ0170RNA, and FSQ0270RNA, consists of an integrated current mode Pulse Width Modulator (PWM) and an avalanche-rugged 700V Sense FET. It is specifically designed for high-performance off-line Switch Mode Power Supplies (SMPS) with minimal external components. The integrated PWM controller features include: a fixed-frequency generating oscillator, Under-Voltage Lockout (UVLO) protection, Leading Edge Blanking (LEB), an optimized gate turn-on/ turn-off driver, Thermal Shutdown (TSD) protection, and temperature compensated precision current sources for loop compensation and fault protection circuitry.
Compared to a discrete MOSFET and controller or RCC switching converter solution, the FSQ0170RNA, and FSQ0270RNA reduces total component count, design size, and weight while increasing efficiency, productivity, and system reliability. These devices provide a basic platform that is well suited for the design of cost-effective flyback converters, as in PC auxiliary power supplies.

Related Application Notes
 AN-4134: Design Guidelines for Off-line Forward Converters Using Fairchild Power Switch (FPS™)
 AN-4137: Design Guidelines for Off-line Flyback Converters Using Fairchild Power Switch (FPS™)
 AN-4141: Troubleshooting and Design Tips for Fairchild Power Switch (FPS™) Flyback Applications
 AN-4147: Design Guidelines for RCD Snubber of Flyback
 AN-4148: Audible Noise Reduction Techniques for FPS™ Applications


Ordering Information

Product Number FSQ0170RNA FSQ0270RNA

Package 8DIP 8DIP

Marking Code Q0170RA Q0270RA

BVDSS 700V 700V

fOSC 100kHz 100kHz

RDS(ON) (MAX.) 11 7.2

FPSTM is a trademark of Fairchild Semiconductor Cor

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