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    Point-of-Load (POL) and Multi-Phase Converters

    T09.9 - Compensation-Winding-Current-Based Constant On-Time Control of Trans-Inductor Voltage Regulators

    Wednesday, March 25, 2026
    11:40 AM - 12:00 PM CT
    Location: 214A
    This digest proposes a compensation-winding-current (iLc)-based constant on-time (COT) control strategy for trans-inductor voltage regulators (TLVRs) for data center applications. Compared with conventional COT control of TLVR, which requires high-bandwidth current sensing for each phase, the proposed approach achieves equivalent transient performance by sensing only iLc, thereby significantly reducing control complexity. The high-pass filter nature of iLc-based current sensing and the corresponding preservation of the high-frequency current ripple needed for COT control are first discussed and simulated. Then, the proposed iLc-based COT control is introduced. Finally, the proposed control strategy is experimentally validated on a six-phase, 500 kHz, 12 V-to-1 V, 240 A TLVR prototype exhibiting robust load regulation under a 6A/ns load step generated by a custom on-board GaN-based load stepper.