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This literature is subject to all applicable copyright laws and is not for resale in any manner.FSQ0370RNA / FSQ0370RLA Green Mode Fairchild Power Switch (FPS) March 2012 FSQ0370RNA, FSQ0370RLA Green Mode Fairchild Power Switch (FPS) Features Description The FSQ0370 consists of an integrated Current Mode Internal Avalanche Rugged 700V SenseFET Pulse Width Modulator (PWM) and an avalanche rugged Consumes Only 0.8W at 230V & 0.5W Load with AC 700V SenseFET. It is specifically designed for high- Burst-Mode Operation performance offline Switched Mode Power Supplies (SMPS) with minimal external components. The Precision Fixed Operating Frequency: 100kHz integrated PWM controller features include: a fixed- Internal Startup Circuit and Built-in Soft-Start frequency generating oscillator, Under-Voltage Lockout (UVLO) protection, Leading-Edge Blanking (LEB), an Pulse-by-Pulse Current Limiting, Auto-Restart Mode optimized gate turn-on / turn-off driver, Thermal Over-Voltage Protection (OVP), Overload Shutdown (TSD) protection, and temperature- Protection (OLP), Internal Thermal Shutdown compensated precision current sources for loop Function (TSD) compensation and fault protection circuitry. Under-Voltage Lockout (UVLO) Compared to a discrete MOSFET and controller or RCC switching converter solution, the FSQ0370 reduces total Low Operating Current: 3mA component count, design size, and weight while Adjustable Peak Current Limit increasing efficiency, productivity, and system reliability. These devices provide a basic platform that is well suited for the design of cost-effective flyback converters, Applications such as in PC auxiliary power supplies. Auxiliary Power Supply for PC and Server SMPS for VCR, SVR, STB, DVD, and DVCD Player Related Application Notes Printer, Facsimile, and Scanner AN-4134 Design Guidelines for Off-line Forward Adapter for Camcorder Converters Using Fairchild Power Switch (FPS) AN-4137 Design Guidelines for Offline 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 Converters Ordering Information Part Number Package Marking Code BV f R DSS OSC DS(ON)(MAX) FSQ0370RNA 8-Lead, Dual Inline Package (DIP) Q0370RA 700V 100KHz 4.75 FSQ0370RLA 8-Lead, LSOP 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com FSQ0370RNA / FSQ0370RLA Rev. 1.0.2