5Q0765RT Datasheet – Power Switch IC ( FPS ) – 500765RT

What is 5Q0765RT?

This is a power switch IC designed for use in offline AC/DC power supplies.

5Q0765RT is a member of the KA5Q series of power switch ICs manufactured by Fairchild Semiconductor. The device integrates a 650V power MOSFET, PWM controller, start-up circuit, and protections like over-voltage, over-current, and over-temperature.

Function: Fairchild Power Switch (FPS)

Package: TO-220F-5L, TO-3PF-5L type

Manufacturer: Fairchild Semiconductor

Fairchild Semiconductor Corporation, a semiconductor manufacturing company, was acquired by ON Semiconductor Corporation on September 18, 2016.

Image and Pinouts:

5Q0765RT datasheet


The Fairchild Power Switch(FPS) product family is specially designed for an off-line SMPS with minimal external components. The Fairchild Power Switch(FPS) consist of high voltage power SenseFET and current mode PWM controller IC.


5Q0765RT fairchild

PWM controller features integrated fixed oscillator, under voltage lock out, leading edge blanking, optimized gate turn-on/ turn-off driver, thermal shut down protection, over voltage protection, temperature compensated precision current sources for loop compensation and fault protection circuit.

Block Diagram

5Q0765RT Block Diagram


1. Quasi Resonant Converter Controller

2. Internal Burst Mode Controller for Stand-by Mode

3. Pulse by Pulse Current Limiting

4. Over Current Latch Protection

5. Over Voltage Protection (Vsync: Min. 11V)

6. Internal Thermal Shutdown Function

7. Under Voltage Lockout

8. Internal High Voltage Sense FET

9. Auto-Restart Mode


1. This is an integrated solution for AC/DC power supplies, simplifying the design and reducing the component count, board space, and cost.

2. The device has a high power conversion efficiency, which is critical for power supplies that run continuously.

3. The built-in protections enhance the reliability and safety of the power supply, and reduces the risk of damage to downstream components.


1. The device is not suitable for high power applications above 5 watts.

2. This requires a heat sink to dissipate the heat generated during operation.

3. The device is not easy to repair, as it contains integrated circuits that require specialized tools and equipment.


5Q0765RT Datasheet

5Q0765RT pdf

Other data sheets are available within the file: 500765RT, KA5Q0765RT

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