LD7792STransition-Mode PFC and Quasi-Resonant Current Mode PWM Controller
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.
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
