Abstract
A LED (Light Emitting Diode) driver operating under a DC input voltage and driving a series of high power LEDs, is presented in this paper. Different topologies of LED driver feeding a constant current into a LED load and their operation principles are analyzed and discussed in detail. Then, a laboratory prototypes of constant-current LED drivers based on DC-DC buck converter with full dimming capability is designed, implemented, and tested. Experimental results show good agreement with simulation results.