This part is a kind of semiconductor called LD7576J.
Function of this product has Green-Mode PWM Controller.
Manufacturers : Leadtrend
Image and pinout :
Some of the text within the PDF file :
LD7576/76H/76J/76K 12/5/2007 Green-Mode PWM Controller with High-Voltage Start-Up Circuit and Adjustable OLP Delay Time REV. 03 General Description The LD7576X series bring high performance, combines with highly integrated functions, protections and EMI-improve solution. It’s an ideal solution for those cost-sensitive system, reducing component count and overall system cost. The LD7576X series features near-lossless high voltage startup circuit, green-mode power-saving operation, leading-edge blanking of the current sensing and internal slope compensation. They also consist with more protections of OLP (Over Load Protection), OVP (Over Voltage Protection) and OTP (Over Temperature Protection) to prevent the circuit damage under abnormal conditions. The LD7576X series are available in D [ ... ]