This part is a kind of semiconductor called KA1M0680B.

Function of this product has Fairchild Power Switch(FPS).

Manufacturers : Fairchild

Image and pinout :

Some of the text within the PDF file :

www.fairchildsemi.com KA1M0680B/KA1M0680RB/ KA1H0680B/KA1H0680RFB Fairchild Power Switch(FPS) Features • • • • • • • • • • • • Precision fixed operating frequency KA1M0680B,KA1M0680RB (67KHz) KA1H0680B,KA1H0680RFB (100KHz) Pulse by pulse over current limiting Over load protection Over voltage protection (Min. 23V) Internal thermal shutdown function Under voltage lockout Internal high voltage sense FET Latch up mode (KA1M0680B,KA1H0680B) Auto restart (KA1M0680RB,KA1H0680RFB) Soft start Description The Fairchild Power Switch(FPS) product family is specially designed for an off-line SMPS with minimal external components. The Fairchild Power Switch(FPS) consist of high voltage power SenseFET and current mode PWM controller IC. PWM controller features integrated fixed [ ... ]

KA1M0680B PDF Datasheet Download