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LD7577JAGN

High Voltage Green-Mode PWM Controller with Brown-Out Protection

Unspecified 

LD7577JA

8/16/2010

High Voltage Green-Mode PWM Controller with

Brown-Out Protection

Rev. 00b

General Description

The LD7577JA integrated several functions of protections,

and EMI-improved solution in a SOP-7, SOP-8/or DIP-8

package. It minimizes the component counts and the

circuit space, and it’s perfect for the low cost of

applications.

It provides functions of low startup current, green-mode

power-saving operation, leading-edge blanking of the

current sensing and internal slope compensation. Also,

the LD7577JA features more protections like OLP (Over

Load Protection), OVP (Over Voltage Protection), and

brownout protection to prevent the circuit being damaged

from the abnormal conditions.

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 Internal Frequency Trembling

z Internal Slope Compensation

z Internal Over Current compensation

z OVP (Over Voltage Protection) on Vcc

z AC Input OVP (Over Voltage Protection)

z OLP (Over Load Protection)

z Brownout Protection

z 500mA Driving Capability

Furthermore, the LD7577JA features frequency trembling

to suppress the noise and is an excellent solution for EMI

filter design.

Applications

z Switching AC/DC Adaptor and Battery Charger

z Open Frame Switching Power Supply

z LCD Monitor/TV Power

Typical Application

AC

input

EMI

Filter

*

HV VCC OUT

LD7577JA

*

BNO

CS

GND COMP

*See Application Information

photocoupler

TL431

Leadtrend Technology Corporation

LD7577JA-DS-00b August 2010

1

www.leadtrend.com.tw

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