© 2014 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FAN8831

• Rev. 1.0

3

Pin Configuration

FAN8831

EN

INPUT

OUT2

COMP

LX

OCP

OUT1

FO

ADJ

NC

NC

LX

Figure 3.

Pin Assignments

Pin Definitions

Pin #

Name

Description

1,2

PGND1

Power Ground 1. It is connected to the source of the step-up switch.

3

Power supply of step-up DC-DC converter.

4

SGND

Signal Ground. The signal ground for step-up DC-DC converter circuitry.

5

ZCD

The input of the zero current detection.

6

FB

Step-up DC-DC converter output voltage feedback input.

7

COMP

Output of the transconductance error amplifier.

8

OCP

Sets Step-up DC-DC converter current limit.

9

FO

Fault Output.

10

EN

Enable pin to turn on and off the overall system. (Active Low Shutdown Mode).

11

INPUT

Logic input for sinusoidal waveform.

12

ADJ

Output voltage adjust control pin. Connect to internal current source to change output

voltage using an external resistor. Connect a small capacitor (1 nF).

13

RT

Oscillator frequency control pin.

14

OVP

Voltage sense input of Step-up DC-DC converter for Over-Voltage Protection.

15

AGND

Analog Ground. The signal ground for full-bridge driver circuitry.

16

Power supply of 5 V LDO.

17

Power supply of full-bridge driver.

18

PGND2

Power Ground 2. The power ground for full-bridge driver .

19

NC

Not Connected

20

OUT2

Output 2 for full-bridge driver.

21

OUT1

Output 1 for full-bridge driver.

22

NC

Not Connected

23, 24

Switch Node. This pin is connected to the inductor.