FAN7930C Просмотр технического описания (PDF) - Fairchild Semiconductor

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FAN7930C

Critical Conduction Mode PFC Controller

Fairchild Semiconductor 

Pin Configuration

Figure 3. Pin Configuration (Top View)

Pin Definitions

Pin #

1

2

3

4

5

6

7

8

Name Description

INV

This pin is the inverting input of the error amplifier. The output voltage of the boost PFC converter

should be resistively divided to 2.5V.

RDY

This pin is used to detect PFC output voltage reaching a pre-determined value. When output

voltage reaches 89% of rated output voltage, this pin is pulled HIGH, which is an (open-drain)

output type.

COMP

This pin is the output of the transconductance error amplifier. Components for the output voltage

compensation should be connected between this pin and GND.

This pin is the input of the over-current protection comparator. The MOSFET current is sensed

CS using a sensing resistor and the resulting voltage is applied to this pin. An internal RC filter is

included to filter switching noise.

ZCD

This pin is the input of the zero-current detection block. If the voltage of this pin goes higher than

1.5V, then goes lower than 1.4V, the MOSFET is turned on.

GND

This pin is used for the ground potential of all the pins. For proper operation, the signal ground

and the power ground should be separated.

OUT

This pin is the gate drive output. The peak sourcing and sinking current levels are +500mA and

-800mA, respectively. For proper operation, the stray inductance in the gate driving path must be

minimized.

VCC This is the IC supply pin. IC current and MOSFET drive current are supplied using this pin.

© 2010 Fairchild Semiconductor Corporation

FAN7930C • Rev. 1.0.0

3

www.fairchildsemi.com

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