This part is a kind of semiconductor called TNY277G.

Function of this product has (TNY274 - TNY280) Energy Efficient / Off-Line Switcher.

Manufacturers : Power Integrations

Image and pinout :

Some of the text within the PDF file :

TNY274-280 ® TinySwitch-III Family Product Highlights Energy Efficient, Off-Line Switcher with Enhanced Flexibility and Extended Power Range + + DC Lowest System Cost with Enhanced Flexibility Output • Simple ON/OFF control, no loop compensation needed • Selectable current limit through BP/M capacitor value Wide-Range D - Higher current limit extends peak power or, in open HV DC Input EN/UV frame applications, maximum continuous power BP/M TinySwitch-III - Lower current limit improves efficiency in enclosed S adapters/chargers - Allows optimum TinySwitch-III choice by swapping PI-4095-082205 devices with no other circuit redesign • Tight I2f parameter tolerance reduces system cost Figure 1. Typical Standby Application. - Maximizes MOSFET and magnetics power [ ... ]

TNY277G PDF Datasheet Download