【Product Feature】‧Internally synchronized leading edge PFC and trailing edge PWM in one IC.
‧Low operating current.
‧Innovative Switching-Charge multiplier-divider.
‧Average-current-mode for input-current shaping.
‧PFC with over-voltage and under-voltage protections.
‧PFC with feedback open-loop protection.
‧Cycle-by-cycle current limiting for PFC/PWM.
‧Power on sequence control and soft-start.
‧Interleaved PFC/PWM switching.
‧Pin to pin compatible for ML4800 and FAN4800 andCM6800 and CM6800A.
‧PWM configurable for current-mode or feed-forward voltage-mode operation.
【Application】‧Desktop PC Power Supply
‧Internet Server Power Supply
‧LCD TV, Monitor Power Supply
‧DC Motor Power Supply
‧Monitor Power Supply
‧Telecom System Power Supply
【Overview】The highly integrated FAN4800A/B is specially designed for power supplies consist of boost PFC and Forward PWM. It requires very few external components to achieve versatile protections/ compensation. It is available in 16-pin DIP package and SOP package. The PWM can be used in either current or voltage mode. In voltage mode, feed-forward from the PFC output bus can be used to improve the PWM’s line regulation. To start evaluating FAN4800A/B from the exiting FAN4800, ML4800 board, 5 things need to be taken care before doing the fine tune.