To overcome the degradation of the transient performance of switching DC DC converters, which was caused by the loop delay in the digital controller, the presence of time delay and its effect on the transient performance was studied, and then the improvement skills were discussed. By the introduction of digital algorithm and sequential diagram, the presence of the loop delay was shown. Based on the digltal peak voltage control, the method to compare the rest time in the present switching period and the duty ratio related time was proposed. By analysis, it showed that it was possible to output the duty ratio and it led to the decrease of the loop delay. On the same application platform, the simulation and experiments were carried out to show the improvement of the transient performance. The results showed that the proposed method was simple, and can improve the transient performance in certain degree.
