Effects of circuit and operating parameters on the small-signal dynamics of average-current-mode-controlled DC-DC converters

This paper presents a detailed and quantitative analysis of parameter effects on the small signal dynamics of DC-DC converters with average current mode control. The parameters under study include the converter circuit and its operating parameters. Their effects on the converter frequency response are analyzed and clearly characterized in low, mid, and high frequency ranges of the control-to-output voltage transfer function of the control scheme. In addition, new insights into average current mode control are uncovered and discussed. Measurable results on an experimental averaged-current mode-controlled Buck converter are provided to facilitate the analytical study with good correlation.