This is one of the semiconductor types. This part name is STR-G6653.
This product has OFF-LINE QUASI-RESONANT FLYBACK SWITCHING REGULATOR functions.
Manufacturers of product is Allegro.
Image and pinout :
STR-G6653 PDF Datasheet
Some of the text files within the PDF file
Data Sheet 28102.9* STR-G6653 GROUND 3 SUPPLY 4 OSC. FDBK LATCH VIN OCP UVLO OVP TSD 5 OFF-LINE QUASI-RESONANT FLYBACK SWITCHING REGULATOR The STR-G6653 is specifically designed to satisfy the requirements for increased integration and reliability in off-line quasi-resonant flyback converters. This device incorporates the primary control and drive circuit with a discrete avalanche-rated power MOSFET. Cycle-by-cycle current limiting, under-voltage lockout with hysteresis, over-voltage protection, and thermal shutdown protects the power supply during the normal overload and fault conditions. Over-voltage protection and thermal shutdown are latched after a short delay. The latch may be reset by cycling the input supply. Low-current startup and a low-power standby mode selected from the secondary circuit completes a comprehensive suite of features. The device is provided in a five-pin over-molded TO-220 style package, affording dielectric isolation without compromising thermal cha [ … ]
Please refer to the file for details.