This part is a kind of semiconductor called WS2803.

Function of this product has 18-Channel Constant Current LED Driver.

Manufacturers : Worldsemi

Image and pinout :

Some of the text within the PDF file :

Preliminary Features ●Supports both constant voltage and constant current drive mode 　 Constant output current range -5-30mA@5V supply voltage -5-20mA@3.3V supply voltage ●18 constant current driving channels ● 30V high voltage output channels ● 8bit PWM gray level control ● Precision output driving current Between channels in a chip: ±2 % Between chips: ±4% ● Maximum clock frequency up to 25MHz. ● Free run ability ● Over temperature protection General Description Applications WS2803 18-Channel Constant Current LED Driver With Programmable PWM Outputs ● LED decorative lighting ● Indoor/Outdoor LED video or massage display The WS2803 is a constant current LED driver. It is designed for indoor/ outdoor LED displays and decorative LED lighting system. It is suitable [ ... ]

WS2803 PDF Datasheet Download