Small signal analysis and modeling of a voltage mode controlled multiphase voltage regulator with load line positioning and phase current balancing

Multiphase interleaved buck converter topology is widely used in voltage regulator (VR) applications to power the microprocessors. Voltage mode and current mode control are the two major control methods applied to VR regulation. Compared to current mode control, voltage mode control demonstrates less limitation on the loop bandwidth and less complexity in the term of design. In this paper, small signal analysis of the VR and its model is established for a voltage mode controlled voltage regulator with load line positioning (voltage droop control) and phase current balancing technique to guide the design for improved transient performance of output voltage regulation and accelerated response of phase current balancing.