LD7576 datasheet(1/22 Pages) LEADTREND

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LD7576/76H/76J/76K

12/9/2009

1

Leadtrend Technology Corporation

www.leadtrend.com.tw

LD7576-DS-04a

December 2009

Green-Mode PWM Controller with High-Voltage

Start-Up Circuit and Adjustable OLP Delay Time

REV. 04a

General Description

The LD7576X series brings high performance, and

combines highly integrated functions, protections and

EMI-improve solution. It’s an ideal solution for those

cost-sensitive systems, reducing component count and

overall system cost.

The LD7576X series features near-lossless high voltage

startup

circuit,

green-mode

power-saving

operation,

leading-edge blanking of the current sensing and internal

slope compensation.

They are also equipped with

protections, such as OLP (Over Load Protection), OVP

(Over Voltage Protection) and OTP (Over Temperature

Protection), to prevent circuit damage under abnormal

conditions.

The LD7576X series is available in DIP-8 and SOP-8,

SOP-7 packages.

Features

High-Voltage (500V) Startup Circuit

Current Mode Control

Non-Audible-Noise Green Mode Control

UVLO (Under Voltage Lockout)

LEB (Leading-Edge Blanking) on CS Pin

Internal Slope Compensation

OVP (Over Voltage Protection) on Vcc

On-Chip OTP (Over Temperature Protection)

OLP (Over Load Protection)

Latch Mode Protection by CT pin

500mA Driving Capability

Adjustable OLP delay time

Applications

Switching AC/DC Adaptor and Battery Charger

Open Frame Switching Power Supply

LCD Monitor/TV Power

Typical Application

EMI

Filter

CT

OUT

CS

VCC

GND

COMP

LD7576X

photocoupler

AC

input

TL431

HV

*

See Application Information

Số phần tương tự - LD7576

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