The WD35-S28A is an AC Direct LED Driving IC with internal 2 channels and external 2 channels. It can drive several series LEDs from rectified AC voltage. It will give much convenience to the design because it requires a small number of external components. The WD35-S28A has higher LED current drive capability and the current can be adjustable with external resistors. The WD35-S28A will help engineers to produce excellent products in LED lightings for energy efficiency, design efficiency, cost efficiency, and so on.