Description:

The FSQ0265RN, marked "Q0265R" on the package with the ON Semiconductor logo, is an integrated PWM controller and high-voltage power MOSFET (SenseFET) combined in a single 8-pin DIP package, designed for offline switch-mode power supplies. It's part of the FSQ-series, an integrated Pulse-Width Modulation controller and SenseFET specifically designed for valley switching operation with minimal external components, which generally shows lower EMI and higher power conversion efficiency than a conventional hard-switched converter with a fixed switching frequency. The PWM controller includes an integrated fixed-frequency oscillator, under-voltage lockout, and Leading-Edge Blanking (LEB). Combining the controller and power switch into one die reduces total component count, board space, and BOM cost compared to a discrete MOSFET + PWM controller solution — a common approach in compact chargers, adapters, and small SMPS boards.

Key Specifications

• Type: Integrated PWM Controller + Power MOSFET (Fairchild Power Switch)
• Manufacturer: onsemi (formerly Fairchild Semiconductor)
• Package Marking: Q0265R
• Package: 8-Pin DIP (PDIP-8)
• Drain-Source Voltage: 650V
• Rated Current: 2A
• Switching Topology: Quasi-resonant / valley switching (Green Mode)
• Built-in protections: Under-voltage lockout, Leading-Edge Blanking, self-protection circuitry
• RoHS compliant (typical for this series)

Common Applications

• AC-DC switch-mode power adapters/chargers
• Offline flyback converters (typically for supplies around 16W) 
• LCD/LED TV and monitor power boards
• Auxiliary/standby power supplies

Package Includes

• 1 x onsemi FSQ0265RN Power Switch IC (8-Pin DIP)