Transition-Mode PFC and Quasi-Resonant Current Mode PWM Controller
The LD7798BD/ID/OD features transition mode Power Factor Correction (PFC) voltage mode controller and Quasi-Resonant (QR) current mode controller for high power application.
There are intelligent PFC on/off, zero current detection (ZCD) without aux-winding and frequency limitation mechanism to achieve better performance.
The IC is also integrated several functions of protection, such as brown-in/out protection, overload protection (OLP), over temperature protection (OTP),
PFC Bulk over voltage protection (PFC OVP), output over ooltage protection (FBAUX OVP), over current protection (OCP) with high / low line compensation and a latch pin
for customize control. Therefore, it can protect the system from damage due to occasional failure.
The LD7798BD/ID/OD is available in a SOP-16 package.
▲ Integrated PFC Boost and QR Flyback Controller
▲ Voltage mode transition operation for PFC
▲ Current mode quasi-resonant operation for Flyback
▲ 150V max. input voltage rating for wide range output voltage applications
▲ Smart stabilization system and high efficiency for USB-PD applications
▲ 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 (over temperature protection) and external latch protection
▲ 550/-1000mA PFC Gate source/sink capability
▲ 350/-1000mA Flyback Gate source/sink capability