This part is a kind of semiconductor called WT7514L.
Function of this product has PWM.
Manufacturers : Weltrend
Image and pinout :
Some of the text within the PDF file :
The WT7514L is a pulse-width modulation (PWM). It contains various functions.
1. Complete PWM Control and Protection Circuitry
Over Voltage Protection for 3.3V / 5V / 12V / PT
Power Good Output is Open Drain Output
250 mS Time Delay for UVP [ ... ]