LD7792S中文资料Transition-Mode PFC and Quasi-Resonant Current Mode PWM Controller数据手册Leadtrend规格书

描述 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

应用 Application

• LED lighting