LD7831

2

Leadtrend Technology Corporation

www.leadtrend.com.tw

LD7831-DS-00 April 2014

Pin Configuration

1

8

2

3

4

5

TOP MARK

YYWWPP

6

1

8

2

3

4

5

TOP MARK

YYWWPP

6

7

SOP-7

SOP-8

YY:

Year code

WW:

Week code

PP:

Production code

Ordering Information

Part number

Package

Top Mark

Shipping

LD7831 GR

SOP-7

LD7831 GR

2500 /tape & reel

LD7831 GS

SOP-8

LD7831 GS

2500 /tape & reel

The LD7831 is ROHS compliant/ green packaged.

Pin Descriptions

Pin

NAME

FUNCTION

1

ZCD

Quasi resonance detector, which supports programmable maximum

on-time. This pin receives the auxiliary winding voltage through a

resister divider and detects the quasi resonance. It also provides

protection for over-voltage output.

2

COMP

Loop compensation pin. Connect a capacitor with it to stabilize the

control loop.

3

CS

Current sense pin, connect it to sense the MOSFET current for OCP

4

GND

Ground

5

OUT

Gate drive output to drive the external MOSFET

6

VCC

Power source VCC pin

7

NC

Not connected.

8

HV

Connect this pin to the positive of main bulk cap to provide the

startup current for controller.