This part is a kind of semiconductor called CXA3810M.
Function of this product has AC-DC Controller.
Manufacturers : Sony
Image and pinout :
Some of the text within the PDF file :
AC-DC Controller CXA3810M Description The CXA3810M has optimum configuration to realize various power supply circuits easily and compactly by including Power-factor correction, resonant controller and various protection function in one package. (Applications: Power supply circuit, etc.) Features Power-factor correction Critical conduction mode PFC control Supports W/W input Start timer Maximum frequency limit (During overcurrent detection) Continuous overcurrent detection protection function Timer-latch over current protection Soft start function Adjustment minimum frequency limit Pulse over current load detection Adjacent 2-pin short protection Various protection functions including overvoltage and overcurrent AC off detection PF [ ... ]