LD7752GS datasheet(1/17 Pages) LEADTREND

Il numero della parte	LD7752GS

Spiegazioni elettronici	Green-Mode PWM Controller with HV Start-Up Circuit and Soft Start time Adjustment

PDF	17 Pages

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Produttore elettronici	LEADTREND [Leadtrend Technology]

Homepage	https://www.leadtrend.com.tw/

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LD7752

06/14/2013

1

Leadtrend Technology Corporation

www.leadtrend.com.tw

LD7752-DS-01 June 2013

Green-Mode PWM Controller with HV Start-Up Circuit and

Soft Start time Adjustment

REV. 01

General Description

The LD7752 brings high performance, highly integrated

functions, protections and EMI-improve solution. It

’s an

ideal solution for those cost-sensitive system, reducing

component count and overall system cost.

The

LD7752

features

high

voltage

startup

circuit,

minimum loss and green-mode power-saving operation,

leading-edge blanking of the current sensing and internal

slope

compensation.

They

also

consist

of

more

protections of OLP (Over Load Protection) and OVP (Over

Voltage Protection) to prevent the circuit from damage

under abnormal conditions.

Furthermore, the proprietary frequency swapping function

can reduce the noise and help the power circuit designers

to enhance EMI performance with fewer components and

less developing time.

Features

 High-Voltage Startup Circuit

 UVLO (Under Voltage Lockout)

 LEB (Leading-Edge Blanking) on CS Pin

 Internal Frequency swapping

 Internal Slope Compensation

 Internal OCP Compensation

 OVP (Over Voltage Protection) on Vcc Pin

 OLP (Over Load Protection)

 +250mA/-500mA Driving Capability

 Soft-Driving

 Soft Start Time and Grouping Frequency Adjustment

Applications

 LCD Monitor/TV Power

 Switching AC/DC Adaptor and Battery Charger

 Open Frame Switching Power Supply

Typical Application

EMI

Filter

OUT

CS

VCC

GND

COMP

LD7752

photocoupler

AC

input

HV

*

CT

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