This part is a kind of semiconductor called SG6859.

Function of this product has Low Cost Green-Mode PWM Controller.

Manufacturers : Fairchild Semiconductor

Image and pinout :

Some of the text within the PDF file :

Product Specification Low Cost Green-Mode PWM Controller for Flyback Converters SG6859 FEATURES „ „ „ „ „ „ „ „ „ „ „ „ „ „ „ „ „ Green-Mode PWM Supports the “Blue Angel” Standard Low Start-up Current (9uA) Low Operating Current (3mA) Leading-Edge Blanking Constant Output Power Limit Universal Input Built-in Synchronized Slope Compensation Current Mode Operation Cycle-by-cycle Current Limiting Under Voltage Lockout (UVLO) Programmable PWM Frequency with Frequency Hopping VDD Over Voltage Protection (Auto Restart) Gate Output Voltage Clamped at 17V Low Cost Few External Components Required Small SOT-26 and Dip 8 Packages DESCRIPTION This highly integrated PWM controller provides several special enhancements designed to meet the low standby-power n [ ... ]

SG6859 PDF Datasheet Download