LD7831 datasheet(1/17 Pages) LEADTREND

Part #	LD7831

Description	High Power Factor Primary Side Flyback LED Controller With HV Start-up

PDF	17 Pages

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Manufacturer	LEADTREND [Leadtrend Technology]

Direct Link	https://www.leadtrend.com.tw/

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LD7831

04/14/2014

1

Leadtrend Technology Corporation

www.leadtrend.com.tw

LD7831-DS-00 April 2014

High Power Factor Primary Side Flyback LED Controller

With HV Start-up

REV: 00

General Description

The LD7831 is a high power factor primary side Flyback

LED controller with HV start-up, specially designed for

LED lighting. The LD7831 provides constant current (CC)

operation requiring neither photo-coupler nor secondary

control circuit. It minimizes the components counts in a

SOP-7. Those make it easy to design for cost- effective

applications.

With HV start-up technology, high power factor and TM

control, the start-up time and resistor loss could be

minimized efficiently. The circuit can easily achieve

PF>0.90 to meet most of the international standard

requirements.

With completed protection built in this IC, such as over

voltage protection (OVP), over current protection (OCP)

and short circuit protection (SCP), the device is capable to

meet the safety requirements.

Features

 High Voltage (700V) Startup Circuit

 High Power Factor Flyback Primary Side PFC

Controller

 High Efficiency Transition Mode Operation

 28V VCC OVP (VCC Over Voltage Protection)

 OCP (Cycle by Cycle Current Limiting)

 SCP (Output Short Protection)

 OTP (Over Temperature Protection)

 CS Short Protection

 Adjustable Output OVP

 250/-500mA Driving Capability

 Internal OTP Function

Applications

 LED Power Supply

 LED Light Bulb/Tube

Typical Application

AC

Input

LD7831

6

1

5

3

4

GND

ZCD

VCC

2

COMP

LED+

LED-

EMI

Filter

8

HV

6

1

5

3

4

GATE

CS

ZCD

VCC

2

EMI

Filter

8

HV

RC

RF

RS

RS,CP1

RS,CP2 (Option)

(Option)

RZ1

RZ2

Fig. 1 Application circuit

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LD7831 Datasheet(PDF) 1 Page - Leadtrend Technology

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