48V/5V direct conversion 1MHz DC-DC converter with 14ns time-delay digital control

Abstract

In this paper, a digital control system for DC-DC converter is presented, which can reduce the latency time of feed back control system effectively. Several experiments have been done in 48V/5V direct conversion 1MHz DC-DC converter to evaluate the time response to sudden load change, the maximum power efficiency and the characteristic of frequency. The results show that the proposed system can reduce the time delay of the digital controller to 14.4ns, and the maximum power efficiency is reached to 85.23%. Besides, the crossover frequency in this system is reached to 268.98kHz, and the phase margin is 41.20deg.