Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 36, Issue 11, Pages 13096-13106Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2021.3076430
Keywords
Constant ON-time (COT); describing function (DF); fast transient; multiphase operation; small-signal modeling
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This article introduces a novel ultrafast transient COT (UFTCOT) control scheme, to enable fast and robust operation even in multiphase converters.
Constant ON-time control (COT) has been widely adopted in buck converters because of its simplicity, fast transient response, and high light-load efficiency. However, the increasing power demands of CPUs and AI/ML engines is pushing voltage regulators to support higher output currents, which typically requires the use of multiphase operation. However, since most high-performance COT schemes utilize ripple as a control variable, the ripple cancellation point in multiphase designs imposes difficult stability concerns, limiting performance, and robustness. In this article, a novel ultrafast transient COT (UFTCOT) control scheme is proposed to enable fast and robust operation even in multiphase converters. The small-signal models of the proposed control scheme are derived based on a describing function technique, whose theoretical results are compared, along with simulation and measurement results, to contrast the proposed UFTCOT technique to exiting approaches.
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