General Description

The LD7792 is the enhancement version of LD7790, the

audible noise produced during start-up & light load is

greatly reduced and the THDi is also further improved.

LD7792 features transition mode Power Factor Correction

(PFC) controller and Quasi-Resonant (QR) current mode

controller for cost effective and fewer external

components design of high power application.

The intelligent PFC switching on/off, zero current

detection (ZCD) and frequency limitation mechanism

enable a better efficiency under any load conditions.

The device is also integrated several functions of

protection, such as X-CAP discharge, brown-in/out

protection, Over Load protection (OLP), Over

Temperature Protection (OTP), Over Voltage Protection

(OVP) and Over Current Protection (OCP) with high / low

line compensation. Therefore it can protect the system

from damage due to occasional failure.

The LD7792 is available in a SOP-16 package.

Features

 Integrated PFC and QR Flyback Controller

 Transition Mode PFC Controller

 Quasi-Resonant Operation for Flyback

 Built-in X-CAP Discharging

 Brown IN/OUT Protection

 Internal Soft-Start Function

 Adjustment OLP Debounce time

 External Latch Protection

 PFC Light Load Turn-off Control

 OVP (Over Voltage Protection)

 OCP (Cycle by cycle current limiting)

 500/-1200mA Driving Capability

 Internal OTP function

Applications

 AC-DC High Power Adapter

 Open Frame SMP

 LED Lighting