A DC-to-DC converter includes one or more switching circuits, a respective energy storage inductor electrically coupled to each of the one or more switching circuits, and a controller. The controller includes a current deficit signal generator, an integration subsystem, one or more modulators, and a clamping subsystem. The current deficit signal generator is adapted to generate a current deficit signal. The integration subsystem is adapted to integrate the current deficit signal to generate a modulator control voltage. The one or more modulators are adapted to control the one or more switching circuits to transfer power from an input power source to a load, based at least in part on the modulator control voltage. The clamping subsystem is adapted to shunt a portion of the current deficit signal away from the integration subsystem, to prevent the modulator control voltage from falling below a predetermined minimum permissible value.