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.

特性 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