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PFC/QR Current Mode PWM Controller ▲ LD7798OD

Product Details

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


PFC/QR Current Mode PWM Controller ▲ LD7798OD