Abstract

Small-signal characteristics of synchronous Buck DC-DC converters under light load conditions are analyzed in this paper. Results of the analysis show that similar to non-synchronous Buck converters operating in discontinuous conduction mode, the double pole of the converter control-to-output voltage transfer function can be split into two real poles under certain conditions. The mechanism of such a phenomenon is analyzed and compared with that of the non-synchronous Buck converter operating in discontinuous conduction mode. Design-oriented equations are derived to model the observed phenomenon and tested against simulation and experimental results to validate the analytical study.

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