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<p>To mitigate the issue of switching frequency instability in constant-on-time (COT) control under wide input voltage variations, a buck DC-DC converter based on adaptive constant-on-time (A-COT) control is proposed in this paper. The propose converter incorporates two key innovations. The on-time duration is dynamically adjusted to be inversely proportional to the input voltage via feed-forward compensation, effectively suppressing input-induced frequency fluctuations. In addition, a filtered switching node signal is integrated into the input voltage feed-forward path to further compensate for the switching frequency. The DC-DC buck converter is fabricated in a standard 0.18&#xa0;μm CMOS process. It operates over an input voltage range of 5&#xa0;V to 48&#xa0;V, delivering an adjustable output voltage from 3.3&#xa0;V to 12&#xa0;V, with the output current ranging from 0&#xa0;mA to 500&#xa0;mA. Experimental results show that, when the input voltage decreases from 30&#xa0;V to 16&#xa0;V under a constant load of 3.3&#xa0;V and 400&#xa0;mA, the switching frequency increases from 515&#xa0;kHz to 650&#xa0;kHz. These results confirm that the proposed control strategy effectively compensates for switching-frequency drift while maintaining stable output voltage regulation.</p>

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Adaptive constant on-time buck converter with frequency compensation for wide input voltage range applications

  • 期刊论文

  • 发表日期：

    2026年2月10日

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  • Yan Liu,
  • Menglong Wu,
  • Jian Deng,
  • Jinyan Pan,
  • Shumin You,
  • Juin J. Liou

摘要

To mitigate the issue of switching frequency instability in constant-on-time (COT) control under wide input voltage variations, a buck DC-DC converter based on adaptive constant-on-time (A-COT) control is proposed in this paper. The propose converter incorporates two key innovations. The on-time duration is dynamically adjusted to be inversely proportional to the input voltage via feed-forward compensation, effectively suppressing input-induced frequency fluctuations. In addition, a filtered switching node signal is integrated into the input voltage feed-forward path to further compensate for the switching frequency. The DC-DC buck converter is fabricated in a standard 0.18 μm CMOS process. It operates over an input voltage range of 5 V to 48 V, delivering an adjustable output voltage from 3.3 V to 12 V, with the output current ranging from 0 mA to 500 mA. Experimental results show that, when the input voltage decreases from 30 V to 16 V under a constant load of 3.3 V and 400 mA, the switching frequency increases from 515 kHz to 650 kHz. These results confirm that the proposed control strategy effectively compensates for switching-frequency drift while maintaining stable output voltage regulation.