Controller and control method of multi-phase power converter

Abstract

A controller for a multi-phase power converter is disclosed. The multi-phase power converter includes first second output stages for respectively generating first-phase and second-phase output currents. The controller includes a current sensing circuit and a current balancing control circuit. The current sensing circuit is coupled to the first and second output stages to sense the first-phase and second-phase output currents to generate first and second current sensing signals. The current balancing control circuit is coupled to the current sensing circuit to receive the first and second current sensing signals. The current balancing control circuit further includes a delay unit, which enables the current balancing control circuit only after a delay period following the response of second output stage to the rising phase signal to begin generating the second-phase output current. The controller of the invention effectively avoids overshoot or undershoot in the output voltage of the multi-phase power converter.

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