LD7798KDTransition-Mode PFC and Quasi-Resonant Current Mode PWM Controller
The LD7798KD features transition mode Power Factor Correction (PFC) voltage mode controller with THDi optimizer and Quasi-Resonant (QR) current mode controller for high power application.
With intelligent PFC on/off, zero current detection (ZCD) without aux-winding and frequency limitation mechanism to achieve better performance.
The IC also integrates several functions, such as brown-in/out protection, Over Load protection (OLP), Over Temperature Protection (OTP), PFC Bulk Over Voltage Protection (PFCOVP), Output Over Voltage Protection (FBAUXOVP), Over Current Protection (OCP) with high / low line compensation and a latch pin for customized control. Therefore it can protect the system from damage due to occasional failure.
The LD7798KD is available in a SOP-16 package.
Features
- Integrated PFC Boost and QR Flyback Controller
- Voltage mode transition operation for PFC
- Current mode quasi-resonant operation for Flyback
- 150V VIN max rating for wide VOUT range application
- Smart stabilization system and high efficiency for USB-PD Application
- Brown in/out protection and X-cap discharge function
- Internal soft start function and PFC on/off control
- OVP (Over voltage protection)
- OCP (Cycle by cycle current limiting)
- Internal OTP function and External latch protection
- 550/-1000mA PFC Gate Source/Sink Capability
- 350/-1000mA Flyback Gate Source/Sink Capability
Applications
- Power Delivery (PD) Application
- Power Adapter
