LD7575

2

Leadtrend Technology Corporation

www.leadtrend.com.tw

LD7575-DS-04b November 2009

Pin Configuration

YY:

Year code

WW:

Week code

PP:

Production code

SOP-8 & DIP-8 (TOP VIEW)

1

8

2

3

4

7

6

5

TOP MARK

YYWWPP

Ordering Information

Part number

Package

Top Mark

Shipping

LD7575 GS

SOP-8

Green Package

LD7575GS

2500 /tape & reel

LD7575 PS

SOP-8

PB Free

LD7575PS

2500 /tape & reel

LD7575 PN

DIP-8

PB Free

LD7575PN

3600 /tube /Carton

The LD7575 is ROHS compliant/ Green Package.

Pin Descriptions

PIN

NAME

FUNCTION

1

RT

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

to set the switching frequency.

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.

3

CS

Current sense pin, connect to sense the MOSFET current

4

GND

Ground

5

OUT

Gate drive output to drive the external MOSFET

6

VCC

Supply voltage pin

7

NC

Unconnected Pin

8

HV

Connect this pin to positive terminal of bulk capacitor to provide the startup current

for the controller. When Vcc voltage trips the UVLO(on), this HV loop will be off to

save the power loss on the startup circuit.