This part is a kind of semiconductor called FAN4803.

Function of this product has 8-Pin PFC and PWM Controller Combo.

Manufacturers : Fairchild Semiconductor

Image and pinout :

Some of the text within the PDF file :

www.fairchildsemi.com FAN4803 8-Pin PFC and PWM Controller Combo Features • Internally synchronized PFC and PWM in one 8-pin IC • Proprietary one-pin voltage error amplifier with advanc input current shaping technique • Peak or average current, continuous boost, leading edge PFC (Input Current Shaping Technology) • High efficiency trailing-edge current mode PWM • Low supply currents; start-up: 150µA typ., operating: 2mA typ. • Synchronized leading and trailing edge modulation • Reduces ripple current in the storage capacitor between the PFC and PWM sections • Overvoltage, UVLO, and brownout protection • PFC VCCOVP with PFC Soft Start General Description The FAN4803 is a space-saving controller for power factor corrected, switched mode power supplies that offers very [ ... ]

FAN4803 PDF Datasheet Download