On the Stability of Peak Current-Controlled Converters: Analysis, Simulation, and Experiments

Mathematical models are developed for the stability analysis of switching regulators operating in the current programmed, or Peak Current Control (PCC), mode. In this paper derivations are detailed for the necessary and sufficient conditions that the parameters of the PCC converter must satisfy in both the single-ended and the push-pull versions of the circuit. Furthermore, the effect of the stabilizing ramp on the steady-state performance is investigated; it is found that there is an optimum value for which the dc output error is truly zero independently of the input disturbance, and another value which results in a ``deadbeat'' response for disturbances of short duration. Finally, an interactive simulation program was developed for the single-ended version of the PCC converter, and implemented on a PDP-15 minicomputer. The results of these simulations agree closely with the predicted behavior, as well as with experimental observations.