CQ0765RT PDF – FSCQ0765RT – Green Mode Power Switch

Part Number: CQ0765RT, FSCQ0765RT

Function: Green Mode Fairchild Power Switch

Package: TO-220F-5L Type

Manufacturer: Fairchild Semiconductor

Preview Images:

CQ0765RT pinout fairchild


The CQ0765RT is an integrated circuit (IC) manufactured by Fairchild Semiconductor (now ON Semiconductor). It is a power switch and controller IC designed for use in power supply applications, particularly in flyback converters.

Drain In general, Quasi-Resonant Converter (QRC) shows lower EMI and higher power conversion efficiency compared to the conventional hard switched converter with a fixed switching frequency. Therefore, it is well suited for applications that are sensitive to the noise, such as color TV and audio. The FSCQ0765RT is an integrated Pulse Width Modulation (PWM) controller and Sense FET specifically designed for Quasi-resonant off-line Switch Mode Power Supplies (SMPS) with minimal external components. The PWM controller includes integrated fixed frequency oscillator, under voltage lockout, leading edge blanking (LEB), optimized gate driver, internal soft start, temperature compensated precise current sources for a loop compensation and self protection circuitry. Compared with discrete MOSFET and PWM controller solution, it can reduce total cost, component count, size and weight simultaneously increasing efficiency, productivity, and system reliability. This device is a basic platform well suited for cost effective designs of Quasi resonant switching flyback converters.


• Optimized for Quasi-Resonant Converter (QRC)

• Advanced Burst-Mode operation for under 1 W standby power consumption

• Pulse by Pulse Current Limit (5A)

• Over load protection (OLP) – Auto restart

• Over voltage protection (OVP) – Auto restart

• Abnormal Over Current Protection (AOCP) – Latch

• Internal Thermal Shutdown (TSD) – Latch

• Under Voltage Lock Out (UVLO) with hysteresis

• Low Startup Current (typical : 25uA)

• Low Operating Current (typical : 4mA)

• Internal High Voltage SenseFET

• Built-in Soft Start (20ms)

• Extended Quasi-resonant Switching for Wide Load Rang

Block Diagram:

CQ0765RT pdf datasheet



• DVD Receiver

• Audio Power Supply

CQ0765RT PDF Datasheet