This part is a kind of semiconductor called FA5542.

Function of this product has Switching Power Supply Control IC Application Note.

Manufacturers : Fuji

Image and pinout :

Some of the text within the PDF file :

FA5540/5541/5542 Fuji Switching Power Supply Control IC FA5540/5541/5542 Application Note Rev.0 July-2007 July 2007 Fuji Electric Device Technology Co., Ltd. 1 http://store.iiic.cc/ Fuji Electric Device Technology FA5540/5541/5542 Caution 1. The contents of this note (Product Specification, Characteristics, Data, Materials, and Structure etc.) were prepared in July 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 industrial property including some [ ... ]

FA5542 PDF Datasheet Download