This part is a kind of semiconductor called FSD210M.

Function of this product has Green Mode Fairchild Power Switch (FPSTM).

Manufacturers : Fairchild Semiconductor

Image and pinout :

Some of the text within the PDF file :

www.fairchildsemi.com FSD210, FSD200 Features Green Mode Fairchild Power Switch (FPSTM) • Single Chip 700V Sense FET Power Switch • Precision Fixed Operating Frequency (134kHz) • Advanced Burst-Mode operation Consumes under 0.1W at 265Vac and no load (FSD210 only) • Internal Start-up Switch and Soft Start • Under Voltage Lock Out (UVLO) with Hysteresis • Pulse by Pulse Current Limit • Over Load Protection (OLP) • Internal Thermal Shutdown Function (TSD) • Auto-Restart Mode • Frequency Modulation for EMI • FSD200 does not require an auxiliary bias winding OUTPUT POWER TABLE 230VAC ±15%(3) PRODUCT FSD210 FSD200 FSD210M FSD200M 85-265VAC Open Open Adapter(1) Adapter(1) Frame(2) Frame(2) 5W 5W 5W 5W 7W 7W 7W 7W 4W 4W 4W 4W 5W 5W 5W 5W Applications • Charger & Adap [ ... ]

FSD210M PDF Datasheet Download