© 2011 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FL7930 • Rev. 1.0.0

4

Pin Configuration

Figure 6. Pin Configurations (Top View)

Pin Definitions

Pin #

Name

Description

1

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.

2

OVP

FL7930B

: This pin is used to detect PFC output over-voltage when INV pin information is not

correct.

RDY

FL7930C

: 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.

3

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.

4

CS

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

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

included to filter switching noise.

5

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.

6

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.

7

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.

8

VCC

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