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Adaptive On-Time Buck Converter with Wave Tracking Reference Control for Output Regulation Accuracy

Author

Listed:
  • Pang-Jung Liu

    (Department of Electrical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan)

  • Mao-Hui Kuo

    (Richtek Technology Corporation, Hsinchu County 30288, Taiwan)

Abstract

A ripple-based constant on-time (RBCOT) buck converter with a virtual inductor current ripple (VICR) control can relax the stability constraint of large equivalent series resistance (ESR) at an output capacitor, but output regulation accuracy deteriorates due to the issue with output DC offset. Thus, this paper proposes a wave tracking reference (WTR) control to improve converter stability with low ESR and concurrently eliminate output DC offset on the regulated output voltage. Moreover, an adaptive on-time (AOT) circuit is presented to suppress the switching frequency variation with load current changes in continuous conduction mode. A prototype chip was fabricated in 0.35 µm CMOS technology for validation. The measurement results demonstrate that the maximum output DC offset is 4.1 mV and the output voltage ripple is as small as 3 mV. Furthermore, the switching frequency variation with the AOT circuit is 11 kHz when load current changes from 50 mA to 500 mA, and the measured maximum efficiency is 90.9% for the maximum output power of 900 mW.

Suggested Citation

  • Pang-Jung Liu & Mao-Hui Kuo, 2021. "Adaptive On-Time Buck Converter with Wave Tracking Reference Control for Output Regulation Accuracy," Energies, MDPI, vol. 14(13), pages 1-14, June.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:13:p:3809-:d:581670
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    Citations

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    Cited by:

    1. Hsiao-Hsing Chou & Hsin-Liang Chen, 2021. "A Novel Buck Converter with Constant Frequency Controlled Technique," Energies, MDPI, vol. 14(18), pages 1-19, September.
    2. Dobroslav Kováč & Tibor Vince & Matej Bereš & Ján Molnár & Jozef Dziak & Patrik Jacko & Irena Kováčová, 2022. "A Universal PSpice Simulation Model of a Switched Buck Voltage Regulator," Energies, MDPI, vol. 15(21), pages 1-19, November.

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