General Description

The LD7790 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 LD7790 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