The FAN4803 is a space-saving controller for power factor corrected, switched mode power supplies that offers very low start-up and operating currents. It includes circuits for the implementation of a leading edge, average current “boost” type power factor correction (PFC) and a trailing edge, pulse width modulation (PWM). The controller has features such as overvoltage, undervoltage, and brownout protection.
The FAN4803 is an 8‑pin Power Factor Correction (PFC) and Pulse Width Modulation (PWM) controller combo designed for space‑saving power supplies. It integrates a leading‑edge boost PFC front end with a trailing‑edge PWM stage, offering low start‑up (150 µA) and operating currents (2 mA) and various protection features such as over‑voltage, UVLO, and soft‑start.
The document details pin assignments, absolute maximum ratings, electrical characteristics, mechanical dimensions, and ordering information for both SOIC and PDIP packages. It also includes functional block diagrams and typical application notes for designers.