FC9931

2012. 10. 31

6/6

Revision No : 0

Pinout

8-Pin DIP/SOIC

16-Pin SOIC

No Connects (NC) are not internally connected and may be used for pass-thru PCB traces

Name SO-16 SO-8

DIP-8

Description

1

1

This pin is the input of a high voltage regulator.

CS1

4

2

This pin is used to sense the input and output

currents of the converter. It is the inverting input

of the internal comparator.

GND

5

3

Ground return for all the internal circuitry. This pin

must be electrically connected to the ground of the

power train.

GATE

8

4

This pin is the output GATE driver for an external

N-channel power MOSFET

PWM_D

9

5

When this pin is pulled to GND, switching of the

FC9931 is disabled. When the PWMD pin is

released, or external TTL high level is applied to

it, switching will resume. This feature is provided

for applications that require PWM dimming of the

LED lamp.

12

6

This is a power supply pin for all internal circuits.

It must be bypassed with a low ESR capacitor to

GND.

CS2

13

7

This pin is used to sense the input and output

currents of the converter. It is the inverting input

of the internal comparator.

14

8

Oscillator control. A resistor connected between

this pin and GND sets the PWM frequency. A

resistor connected between this pin and GATE sets

the PWM off-time.

CS2

CS1

GND

GATE

PWM_D

CS2

CS1

GND

GATE

PWM_D

NC

NC

NC

NC

NC

NC

NC

NC