Analysis and design of type 3 compensator for the buck converter based on PSIM

In this paper, the compensator for the CCM voltage-mode buck converter is selected and designed. First, by using Mathcad, the type 1, type 2, and type 3 compensators are analyzed and developed from the basics. From the compensator analysis, one can know why the type 3 compensator is suitable for the CCM voltage-mode buck converter. Second, by selecting the type 3 compensator, which provides the required phase margin boost, and by determining the required crossover frequency based on the transient voltage spike, the parameters of the type 3 compensator can be obtained. Finally, the effectiveness of the closed-loop load transient response of the buck converter is verified by the PSIM.