FSQ0765RQUDTU Просмотр технического описания (PDF) - Fairchild Semiconductor

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FSQ0765RQUDTU

Green-Mode Fairchild Power Switch (FPS™) for Quasi-Resonant Operation - Low EMI and High Efficiency

Fairchild Semiconductor 

Pin Configuration

FSQ0765R Rev.00

6. Vstr

5. Sync

4. FB

3. VCC

2. GND

1. Drain

Figure 3. Pin Configuration (Top View)

Pin Definitions

Pin # Name

Description

1 Drain SenseFET drain. High-voltage power SenseFET drain connection.

2

GND Ground. This pin is the control ground and the SenseFET source.

3

VCC

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

both startup and steady-state operation.

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

4

FB

collector of an opto-coupler 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 6V, the overload protection

triggers, which shuts down the FPS.

5

Sync

Sync. 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 1.2V/1.0V.

Startup. This pin is connected directly, or through a resistor, to the high-voltage DC link. At

6

Vstr

start-up, the internal high-voltage current source supplies internal bias and charges the external

capacitor connected to the VCC pin. Once VCC reaches 12V, the internal current source is disabled.

It is not recommended to connect Vstr and Drain together.

© 2008 Fairchild Semiconductor Corporation

FSQ0765RQ Rev. 1.0.1

4

www.fairchildsemi.com

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