DPS Based Two-Input BUCK Converter with Application in LED Driver

This paper presents a scheme that the two-input BUCK (TIBUCK) converter is applied to the LED drivers. The performance characteristics of the circuit are analyzed in detail. The TIBUCK converter is designed to operate in the voltage control mode governed by DSP, thus the output current can be adjusted well and the LEDs can then work in the constant current mode. The simulation and experimental results show that the voltage stress of switch and diode in the TIBUCK converter are reduced, and the constant current control for the output current is realized at the same time. Thereby, as the constant-current part of the LED driver, the feasible of the TIBUCK converter is proved.