STR5412 Datasheet PDF datasheet can download.
This is one of the semiconductor types. This part name is STR5412.
Manufacturers of the product is Sanken.
Image and pinout :
Some of the text files within the PDF file
1. 112V 5A 40W
2. Switching Power Source, Voltage Regulator
[ … ]
Pinout and Circuits
Please refer to the file for details.