This part is a kind of semiconductor called FA5550.
Function of this product has Switching Power Supply Control IC.
Manufacturers : Fuji
Image and pinout :
Some of the text within the PDF file :
(Under development) FA5550 / 51 Fuji Switching Power Supply Control IC FA5550 / 51 Application Note (Under development) August 2007 Fuji Electric Device Technology Co.,Ltd. Rev.0 Augu-2007 1 Fuji Electric Device Technology (Under development) FA5550 / 51 Caution 1. The contents of this note (Product Specification, Characteristics, Data, Materials, and Structure etc.) were prepared in August 2007. The contents will subject to change without notice due to product specification change or some other reasons. In case of using the products stated in this document, the latest product specification shall be provided and the data shall be checked. 2. The application examples in this note show the typical examples of using Fuji products and this note shall neither assure to enforce the indu [ ... ]