General Description

The LD7792S is the enhancement version of the LD7790,

the audible noise produced during start-up & light load is

greatly reduced and the THDi is also further improved.

LD7792S 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 LD7792S is available in a SOP-16 package.

特性 Features

? Integrated PFC and QR or PWM Flyback Controller

? Transition mode operation for PFC

? Quasi-resonant operation for Flyback

? Built-in X-CAP discharging

? Brown in/out protection

? Internal soft start function

? Adjustment OLP debounce time

? PFC light load turn-off control

? OVP (Over voltage protection)

? OCP (Cycle by cycle current limiting)

? 500/-1000mA driving capability

? Internal OTP function

? External OTP protection

Applications

? LED lighting