Stable operation of a SMPS (switching voltage power supply) hinges on action within the feedback control and compensation network. The way in which the regulator performs is also influenced by the nature of filters attached on either side of it between the source and load. This article shows how stability can be assessed using only knowledge of the system’s output impedance. There is no need to change or alter the regulator to accommodate extra components which become redundant after test deployment – as is the case with in-loop signal injection or mixing.
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