Peak-Current-Mode Controlled DC-DC Converter Stability Analysis for Buck and Boost Topologies

This work deals with studying, both from the theoretical and experimental point of view, the stability of two DC-DC converter topologies that implement peak-current-mode control performed by Infineon’s proprietary IC’s. In each case is derived a small-signal model, that firstly is related to the power stage and secondly to the control stage. It makes use of the PWM switch model in order to linearize the circuit. In the last part of this work the model is compared to experimental results in order to verify the assumptions. The aim is to obtain a model that takes into account the current loop into the stability analysis of the converter in peak-current-mode.