Abstract
The audio-susceptibility of the average current-mode controlled buck dc-dc converter in continuous-conduction mode is presented in this paper. The average current-mode control scheme used in this paper regulates the true average component of the sensed inductor current and is not affected by a high inductor current ripple at low duty ratios. The principle of negative feedback for converters with the average current-mode control is discussed in brief. The input voltage-to-inductor current disturbance transfer function is derived using the averaged, linear small-signal model. The loop gain transfer function has been analyzed to satisfy the closed-loop requirements. The closed-inner-loop input voltage-to-inductor current transfer function and the closed-inner-loop input-to-output voltage transfer functions are determined. An example buck converter is used and the characteristics are analyzed in detail. Simulation results are presented for the designed buck converter validating the theoretical predictions.
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