A self-calibration scheme for improved current share of multiphase DC-DC converter

In this paper, a self-calibration control scheme is proposed to improve the current share among each phase of multiphase DC-DC converters. The proposed control scheme is based upon look-up table method to automatically tune the pre-stored parameters for compensated in output inductance. Additionally, the digital voltage mode control and current loop with DCR (Direct Current Resistance) sensing method is implemented. As a result, the proposed scheme provides a low cost solution with ease implementation due to it is fully design by digital control technique without any external phase compensation element. The proposed scheme is verified on 12 V input with 1.2 V output, 60 A, 3-phases interleaving DC-DC buck converter and the simulation and experimental results are presented to demonstrate the theoretical analysis.