This part is a kind of semiconductor called PT4213E23F.

Function of this product has Primary Side CC Controller.

Manufacturers : PowTech

Image and pinout :

Some of the text within the PDF file :

PT4213 Primary Side CC Controller GENERAL DESCRIPTION The PT4213 is a primary side regulated constant current controller, which is designed for LED lighting applications. The device is optimized for high performance and cost-effective applications. With Powtech’s proprietary constant current compensation technique accurate constant current regulation is achieved without the need of a secondary feedback circuitry. Integrated primary inductance compensation circuitry provides accurate constant current operation despite variations in primary inductance. Excellent EMI performance is achieved with frequency jittering function together with soft driving control at totem pole gate drive output. The device also features a complete set of protection functions to protect against all fault conditio [ ... ]

PT4213E23F PDF Datasheet Download