Richtek Technology Corporation

Chung-Shu Li

Jian-Rong Huang

Chung-Sheng Cheng

Chia-Jung Lee

A multi-phase power converter with constant on-time control includes a plurality of channels to convert an input voltage into an output voltage, and each of the channels is driven by a control signal. When all channel currents of the channels are balanced, each of the control signals remains a constant on-time. When the channel currents are imbalanced, the on-times of the control signals are modulated according to the difference between each channel current and a target value for current balance between the channels.

Current balance in a multi-phase power converter with constant on-time control

A circuit and method are proposed for constant on-time control for an interleaved multiphase voltage regulator, which monitor the channel currents of all the channels of the interleaved multiphase voltage regulator to select one from the channels to drive and so achieve interleaved phase operation.

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Yonghe, Taiwan

Chung-Shu Li