This part is a kind of semiconductor called HV9910B.

Function of this product has Universal High Brightness LED Driver.

Manufacturers : Supertex

Image and pinout :

Some of the text within the PDF file :

HV9910B Universal High Brightness LED Driver Features ► Switch mode controller for single switch LED drivers ► Enhanced drop-in replacement to the HV9910 ► Open loop peak current controller ► Internal 8.0 to 450V linear regulator ► Constant frequency or constant off-time operation ► Linear and PWM dimming capability ► Requires few external components for operation General Description The HV9910B is an open loop, current mode, control LED driver IC. The HV9910B can be programmed to operate in either a constant frequency or constant off-time mode. It includes an 8.0 - 450V linear regulator which allows it to work from a wide range of input voltages without the need for an external low voltage supply. The HV9910B includes a PWM dimming input that can accept [ ... ]

HV9910B PDF Datasheet Download