Transition-Mode PFC and Quasi-Resonant Current Mode PWM Controller
The LD7791C features transition mode Power Factor correction (PFC) controller and Quasi-Resonant (QR) current mode controller for cost effective and fewer external component 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 RFI X-capacitor 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 IC is available in SMD. LD7791C GS in SOP-16 package.
FEATURES
▲ Integrated PFC and QR flyback controller
▲ Transition mode PFC controller
▲ Quasi-Resonant operation for flyback
▲ Built-in RFI X-capacitor 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 Limit)
▲ 500/-1200mA driving capability
▲ Internal OTP (Over Temperature Protection)
APPLICATIONS
▲ AC/DC high power adaptor
▲ Open frame SMPS
Datasheet 
