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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) controller with THDi optimizer and Quasi-Resonant (QR) current mode controller for high power application.

With intelligent PFC switching ON / OFF, zero current detection (ZCD) without aux-winding and frequency limitation mechanism to achieve better performance.

The IC also integrateds 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 IC is available in SMD. LD7798BD/ID/OD GS in 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 RFI X-capacitor discharge function

▲ Internal soft start function and PFC on/off control

▲ OVP (Over Voltage Protection)

▲ OCP (Cycle by Cycle Current Limit)

▲ Internal OTP (over temperature protection) and external latch protection

▲ 550/-1000mA PFC Gate source/sink capability

▲ 350/-1000mA Flyback Gate source/sink capability


▲ Power delivery (PD) application

▲ Power adaptor


PFC/QR Current Mode PWM Controller ▲ LD7798OD