LD7791CTransition-Mode PFC and Quasi-Resonant Current Mode PWM Controller
The LD7791/A/B/C 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 it to reach better efficiency under any load conditions.
The device also integrates 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 being damaged due to occasional failure.
The LD7791/A/B/C is available in a SOP-16 package.
Features
- Integrate 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 De-bounce time
- External Latch Protection
- PFC Light Load Turn-off Control
- OVP (Over Voltage Protection)
- OCP (Cycle by cycle current limiting)
- 500mA/-1200mA Driving Capability
- Internal OTP function
Applications
- AC-DC High Power Adapter
- Open Frame SMP
