This part is a kind of semiconductor called OB2262.

Function of this product has Current Mode PWM Controller.

Manufacturers : On-Bright

Image and pinout :

Some of the text within the PDF file :

OB2262 Current Mode PWM Controller GENERAL DESCRIPTION OB2262 is a highly integrated current mode PWM control IC optimized for high performance, low standby power and cost effective offline flyback converter applications in sub 30W range. PWM switching frequency at normal operation is externally programmable and trimmed to tight range. At no load or light load condition, the IC operates in extended ‘burst mode’ to minimize switching loss. Lower standby power and higher conversion efficiency is thus achieved. VDD low startup current and low operating current contribute to a reliable power on startup design with OB2262. A large value resistor could thus be used in the startup circuit to minimize the standby power. The internal slope compensation improves system large [ ... ]

OB2262 PDF Datasheet Download