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Fairchild
Fairchild


Q0370RNA

FSQ0370RNA

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FSQ0170RNA, FSQ0270RNA, FSQ0370RNA Green Mode Fairchild Power Switch (FPS™)

December 2006

FSQ0170RNA, FSQ0270RNA, FSQ0370RNA Green Mode Fairchild Power Switch (FPS™)
Features
„ Internal Avalanche Rugged 700V SenseFET „ Consumes only 0.8W at 230 VAC & 0.5W Load with

Description
The FSQ0170RNA, FSQ0270RNA, FSQ0370RNA consists of an integrated current mode Pulse Width Modulator (PWM) and an avalanche-rugged 700V Sense FET. It is specifically designed for high-performance offline 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, FSQ0270RNA, FSQ0370RNA 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.

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

Applications
„ Auxiliary Power Supply for PC and Server „ SMPS for VCR, SVR, STB, DVD & DVCD Player,

Printer, Facsimile & Scanner

„ Adapter for Camcorder

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

8-DIP

Ordering Information
Product Number
FSQ0170RNA FSQ0270RNA FSQ0370RNA

Package
8DIP 8DIP 8DIP

Marking Code
Q0170R Q0270R Q0370R

BVDSS
700V 700V 700V

fOSC
100kHz 100kHz 100kHz

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