This part is a kind of semiconductor called TFC718.

Function of this product has Switching Power Supply Controller.

Manufacturers : TFC Micro-Elec

Image and pinout :

Some of the text within the PDF file :

TFC718 Switching Power Supply Controller Tianfeng Science & Technology 12/06/2005 YinXin Electronic.,Ltd Data Sheet TFC718 Switching Power Supply Controller TFC Micro-Elec. TEL:02083295493 FAX:02083295491 Tianfen TFC718 Switching Power Supply Controller 12/06/2005 Content Brief Introduction, Features, Block Diagram, Pins Description ..3 Description of the Operating Principle.4 Definitions of Electrical Characteristics ..5 Electrical Characteristics Figures. [ ... ]

TFC718 PDF Datasheet Download