General Description

The LD7838H is a 700V HV start-up flyback PFC controller,

specially designed for LED lighting. This device operates in

transition mode(TM) and integrates with completed

protections required. It minimizes the components counts

in either SOP-7 package. Those make it easy to design

with 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 inside this IC, such as

over voltage protection (OVP), over current protection

(OCP), over load protection (OLP), over temperature

protection (OTP), and output short circuit protection

(OSCP), It enable the circuit to meet most safety

requirements in both normal and abnormal test.

Features

 High voltage (700V) startup circuit for 305VAC

 High Power Factor Flyback PFC controller

 High-efficiency Transition mode operation

 Low Operation Current and Fast start up

 Accurate OLP Compensation for High/ Low Line

 BNI/ BNO Detection Function by HV pin

 Wide UVLO (16.5 Von and 8 Voff) Range

 Cycle by Cycle Current Limiting for Over Current

Protection

 OVP (Over Voltage Protection) Function by ZCD

and VCC pin

 Internal OTP function

Applications

 LED Power Supply

 LED Light Bulb/Tube