This part is a kind of semiconductor called TOP258.

Function of this product has (TOP252 - TOP261) Integrated Off Line Switcher.

Manufacturers : Power Integrations

Image and pinout :

Some of the text within the PDF file :

TOP252-261 TOPSwitch-HX Family ® Enhanced EcoSmart , Integrated Off-Line Switcher with Advanced Feature Set and Extended Power Range Product Highlights Lower System Cost, Higher Design Flexibility • Multi-mode operation maximizes efficiency at all loads • New eSIP-7C package builds on PI’s experience with high power and high reliability packages • Low thermal impedance junction-to-case (2 °C per watt) • Low height is ideal for adapters where space is limited • Simple mounting using a clip to aid low cost manufacturing • No heatsink required up to 35 W using P, G and M packages with universal input voltage and up to 48 W at 230 VAC • Output overvoltage protection (OVP) is user programmable for latching/non-latching shutdown with fast AC reset • All [ ... ]

TOP258 PDF Datasheet Download