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LD7750AGR

High Voltage Green-Mode PWM Controller with Over Temperature Protection

Unspecified 

LD7750A

06/25/2010

High Voltage Green-Mode PWM Controller with

Over Temperature Protection

Rev. 00

General Description

The LD7750A integrates several functions of protections,

and EMI-improved solution in a tiny package to minimize

the component counts and the circuit space.

The device provides functions of low startup current,

green-mode power-saving operation, leading-edge

blanking of the current sensing and internal slope

compensation. Also, the LD7750A features more

protections like OLP (Over Load Protection), OVP (Over

Voltage Protection), and OTP (Over Temperature

Protection) to prevent the circuit being damaged under

abnormal conditions. The LD7750A features built-in

auto-recovery function for OVP on Vcc pin and OLP.

Furthermore, the LD7750A features frequency swapping

to depress radiation noise, providing an excellent solution

for EMI filter design.

Features

z High-Voltage (500V) Startup Circuit

z Current Mode Control

z Green Mode Control

z UVLO (Under Voltage Lockout)

z LEB (Leading-Edge Blanking) on CS Pin

z Internal Frequency swapping

z Internal Slope Compensation

z Internal Over Current Protection

z OVP (Over Voltage Protection) on Vcc

z OLP (Over Load Protection)

z External OTP through a NTC

z 500mA Driving Capability

Applications

z Switching AC/DC Adaptor and Battery Charger

z Open Frame Switching Power Supply

z LCD Monitor/TV Power

Typical Application

Leadtrend Technology Corporation

LD7750A-DS-00 June 2010

1

www.leadtrend.com.tw

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