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C01565RT

Green Mode Fairchild Power Switch (FPS™)

Fairchild Semiconductor 

Pin Configuration

TO-220F-5L

5. Sync

4. Vfb

3. Vcc

2. GND

1. Drain

TO-3PF-7L

5. Sync

4. Vfb

3. Vcc

2. GND

1. Drain

Figure 3. Pin Configuration (Top View)

Pin Definitions

Pin Number

1

2

3

Pin Name

Drain

GND

Vcc

4

Vfb

5

Sync

Pin Function Description

High voltage power SenseFET drain connection.

This pin is the control ground and the SenseFET source.

This pin is the positive supply input. This pin provides internal operating current for

both start-up and steady-state operation.

This pin is internally connected to the inverting input of the PWM comparator.

The collector of an optocoupler is typically tied to this pin. For stable operation,

a capacitor should be placed between this pin and GND. If the voltage of this

pin reaches 7.5V, the over load protection triggers, which results in the FPS

shutting down.

This pin is internally connected to the sync detect comparator for quasi-resonant

switching. In normal quasi-resonant operation, the threshold of the sync

comparator is 4.6V/2.6V. Whereas, the sync threshold is changed to 3.0V/1.8V

in an extended quasi-resonant operation.

4

FSCQ-Series Rev. 1.1.2

www.fairchildsemi.com

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