This part is a kind of semiconductor called LD7750.

Function of this product has High Voltage Green-Mode PWM Controller.

Manufacturers : Leadtrend

Image and pinout :

Some of the text within the PDF file :

LD7750 2/23/2010 High Voltage Green-Mode PWM Controller with Over Temperature Protection Rev. 00b General Description The LD7750 integrates several functions of protections, and EMI-improved solution in a SOP-8, SOP-7, or DIP-8 package to minimize the component counts and the circuit space. The device provides functions of low startup current, green-mode compensation. Voltage power-saving Also, the operation, LD7750 OTP leading-edge features more blanking of the current sensing and internal slope protections like OLP (Over Load Protection), OVP (Over Protection), and (Over Temperature Protection) to prevent the circuit being damaged under the abnormal conditions. The LD7750 features built-in auto-recovery function for OVP on Vcc pin and OLP. Furthermore, the LD7750 features frequency swa [ ... ]

LD7750 PDF Datasheet Download