LD7531

2

Leadtrend Technology Corporation

www.leadtrend.com.tw

LD7531-DS-00 June 2008

Pin Configuration

DIP-8 (TOP VIEW)

SOT-26 (TOP VIEW)

YY,

Y : Year code (D: 2004, E: 2005…..)

WW, W: Week code

P

:

LD75..

(Product family code)

##

:

Production code

1

2

3

4

5

6

GND COMP RT

OUT

VCC

CS

WP

1

8

2

3

4

7

6

5

TOP MARK

YYWW##

Y The PB free package is

identified in embossed font

while green package in

regular print

Y

31

Ordering Information

Part number

Package

TOP MARK

Shipping

LD7531 GL

SOT-26

Green Package

YWP/31

3000 /tape & reel

LD7531 GN

DIP-8

Green Package

LD7531GN

3600 /tube /Carton

LD7531 PL

SOT-26

PB Free

YWP/31

3000 /tape & reel

LD7531 PN

DIP-8

PB Free

LD7531PN

3600 /tube /Carton

Note: The LD7531 is ROHS compliant/ Green package.

Pin Descriptions

PIN

(DIP-8)

PIN

(SOT-26)

NAME

FUNCTION

8

1

GND

Ground

7

2

COMP

Voltage feedback pin (same as the COMP pin in UC384X), By connecting

a photo-coupler to close the control loop and achieve the regulation.

5

3

RT

This pin is to program the switching frequency. By connecting a resistor

to ground to set the switching frequency.

4

4

CS

Current sense pin, connect to sense the MOSFET current

2

5

VCC

Supply voltage pin

1

6

OUT

Gate drive output to drive the external MOSFET