Unified model to derive control-to-output transfer function of peak current-mode-controlled pulse-width modulated dc-dc converters in continuous conduction mode

A unified model to derive the control-to-output transfer function of peak current-mode (PCM)-controlled pulse-width modulated dc-dc converters for continuous conduction mode (CCM) is presented. The control-to-output transfer function represents the plant transfer function for the outer-voltage loop and is required to design the outer loop. Control-to-output transfer functions for PCM-controlled pulse-width-modulated dc-dc buck-boost, boost and buck converters are derived and illustrated for selected values of perturbation ratio using MATLAB. Experimental results are given to verify the presented theory for PCM-controlled buck converter.