This is one of the semiconductor types. This part name is SM7307.
This product has Non-Isolated BUCK Constant current control power switch functions.
Manufacturers of product is Sunmoon.
Image and pinout :
SM7307 PDF Datasheet
Some of the text files within the PDF file
SM7307 is an internal integrated power tube efficient PWM-LED constant current drive control chip. Constant current accuracy can reach ± 3% of full voltage range, the chip directly from the DRAIN input voltage supply, not Requires auxiliary windings to supply power.
SM7307 is mainly used for bright BUCK LED driver. Without any compensation components,
You can achieve a constant output current. Less peripheral components, low cost of the program, with LED output is short Road protection features. [ … ]
Please refer to the file for details.