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LD7575PS

Green-Mode PWM Controller

Unspecified 

LD7575

11/29/2007

Green-Mode PWM Controller with High-Voltage

Start-Up Circuit

REV: 04b

General Description

The LD7575 is a current-mode PWM controller with

excellent power-saving operation. It features a high-

voltage current source to directly supply the startup current

from bulk capacitor and further to provide a lossless startup

circuit. The integrated functions such as the leading-edge

blanking of the current sensing, internal slope compensation,

and the small package provide the users a high efficiency,

minimum external component counts, and low cost solution

for AC/DC power applications.

Furthermore, the embedded over voltage protection, over

load protection and the special green-mode control provide

the solution for users to design a high performance power

circuit easily. The LD7575 is offered in both SOP-8 and

DIP-8 package.

Features

z High-Voltage (500V) Startup Circuit

z Current Mode Control

z Non-Audible-Noise Green Mode Control

z UVLO (Under Voltage Lockout)

z LEB (Leading-Edge Blanking) on CS Pin

z Programmable Switching Frequency

z Internal Slope Compensation

z OVP (Over Voltage Protection) on Vcc

z OLP (Over Load Protection)

z 500mA Driving Capability

Applications

z Switching AC/DC Adapter and Battery Charger

z Open Frame Switching Power Supply

z LCD Monitor/TV Power

Typical Application

Leadtrend Technology Corporation

LD7575-DS-04b November 2007

1

www.leadtrend.com.tw

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