This part is a kind of semiconductor called 44608P75.

Function of this product has MC44608P75.

Manufacturers : ON Semiconductor

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Some of the text within the PDF file :

MC44608 Few External Components Reliable and Flexible SMPS Controller The MC44608 is a high performance voltage mode controller designed for off--line converters. This high voltage circuit that integrates the startup current source and the oscillator capacitor, requires few external components while offering a high flexibility and reliability. The device also features a very high efficiency standby management consisting of an effective Pulsed Mode operation. This technique enables the reduction of the standby power consumption to approximately 1.0 W while delivering 300 mW in a 150 W SMPS. General Features  Integrated Startup Current Source  Lossless Off--Line Startup  Direct Off--Line Operation  Fast Startup  Flexibility  Duty Cycle Control  Undervoltage Lockout with [ ... ]

44608P75 PDF Datasheet Download