Patent ID: 8358113
Filing Date: 2013-01-22
Classification: H02J,H02M

Abstract:
1. An apparatus for current balance in a multi-phase power converter with constant on-time control, the multi-phase power converter including a plurality of channels for converting an input voltage into an output voltage, the apparatus comprising: an error current signal generator coupled to the plurality of channels, detecting a difference between a channel current of a selected one of the plurality of channels and a target value to thereby generate a current error signal therefrom for the selected channel; and an on-time generator coupled to the error current signal generator, providing a control signal according to the current error signal to drive the selected channel; wherein the on-time generator remains the control signal with a constant on time when the channel current of the selected channel is equal to the target value, and modulates the on time of the control signal according to the current error signal of the selected channel when the channel current of the selected channel is not equal to the target value.