The whole small signal model and compensation for regulators with current programmed mode

A whole small signal model of current programmed mode (CPM) within half of switching frequency is presented in this paper, which contains models of current loop and voltage loop. The advantages of current programmed mode are described according to this model. Then, the necessity of slope compensation is proved by the derivation of loop gain of current loop. And a significative method of voltage loop compensation is proposed through the derivation of loop gain of voltage loop. Simulation results of the compensation are given to demonstrate the effectiveness of the theoretical outcome in the end.