This part is a kind of semiconductor called STR-A6053M.

Function of this product has Current Mode Control PWM Regulator IC.

Manufacturers : Allegro MicroSystems

Image and pinout :

Some of the text within the PDF file :

www.DataSheet.co.kr STR-A60xxM Current Mode Control PWM Regulator IC For Switching Power Supplies Features and Benefits ▪ Small DIP8 package with 8 to 24 W power output 230 VAC ▪ Current Mode PWM control with 67 kHz switching frequency ▪ Built-in Random Switching function, reducing EMI noise, and simplifying EMI filters, and therefore reducing cost ▪ Built-in Slope Compensation function, avoiding subharmonic oscillation ▪ Built-in Auto Standby function (Input Power, PIN < 25 mW at no load) ▫ Normal operation: PWM mode ▫ Light load operation: Standby mode (burst oscillation) ▪ Built-in Audible Noise Suppression function during Standby mode ▪ Built-in Startup Circuit, reducing power consumption in standby operation, and eliminating external components. ▪ Bias-Assist func [ ... ]

STR-A6053M PDF Datasheet Download