This part is a kind of semiconductor called SD6835.

Function of this product has CURRENT MODE PWM+PFM CONTROLLER.

Manufacturers : SL

Image and pinout :

Some of the text within the PDF file :

Silan Microelectronics SD6835_Datasheet CURRENT MODE PWM+PFM CONTROLLER WITH BUILT-IN HIGH VOLTAGE MOSFET DESCRIPTION SD6835 is current mode PWM+PFM controller used for SMPS with built-in high-voltage MOSFET and external sense resistor. It features low standby power and low start current. In standby mode, the circuit enters burst mode to reduce the standby power dissipation. The switch frequency is 25~67KHz decided by the load with jitter frequency for low EMI. Built-in peak current compensation circuit makes the limit peak current stable even with different input AC voltage. Built-in limit output power compensation circuit to balance the limit output power under different AC voltage inputs. Built-in slope compensation circuit to adapt to more transformer applications. Maxim [ ... ]

SD6835 PDF Datasheet Download