Fully Digital Current Mode Constant On-Time Controlled Buck Converter with Output Voltage Offset Cancellation

Kai Yu Hu; Wei Ting Yeh; Chien Hung Tsai; Chien Wu Tsai

doi:10.1109/ACCESS.2021.3133489

Fully Digital Current Mode Constant On-Time Controlled Buck Converter with Output Voltage Offset Cancellation

Kai Yu Hu, Wei Ting Yeh, Chien Hung Tsai, Chien Wu Tsai

Department of Electrical Engineering

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

Fully digital current mode constant on-time (COT) control buck converter with output voltage offset cancellation is presented in this paper. Current mode COT can achieve fast transient response and low output voltage ripple with additional current path. To fully digitalize the control loop in this work, both current mode control and the additional current path are implement in digital way. However, the current path may induce inevitable output voltage offset. To ensure effective output voltage regulation within all load current ranges, an output voltage offset cancellation mechanism was proposed. A prototype converter was fabricated using 0.18 μm CMOS process technology. The controller was fully implemented as a standard-cell-based digital circuit. Measurement results indicated the output voltage regulation in full-load range was 2%, and 100 mV output voltage overshoot under 2.5A load transient response.

Original language	English
Pages (from-to)	162572-162580
Number of pages	9
Journal	IEEE Access
Volume	9
DOIs	https://doi.org/10.1109/ACCESS.2021.3133489
Publication status	Published - 2021

All Science Journal Classification (ASJC) codes

Computer Science(all)
Materials Science(all)
Engineering(all)

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10.1109/ACCESS.2021.3133489

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title = "Fully Digital Current Mode Constant On-Time Controlled Buck Converter with Output Voltage Offset Cancellation",

abstract = "Fully digital current mode constant on-time (COT) control buck converter with output voltage offset cancellation is presented in this paper. Current mode COT can achieve fast transient response and low output voltage ripple with additional current path. To fully digitalize the control loop in this work, both current mode control and the additional current path are implement in digital way. However, the current path may induce inevitable output voltage offset. To ensure effective output voltage regulation within all load current ranges, an output voltage offset cancellation mechanism was proposed. A prototype converter was fabricated using 0.18 μm CMOS process technology. The controller was fully implemented as a standard-cell-based digital circuit. Measurement results indicated the output voltage regulation in full-load range was 2%, and 100 mV output voltage overshoot under 2.5A load transient response.",

author = "Hu, {Kai Yu} and Yeh, {Wei Ting} and Tsai, {Chien Hung} and Tsai, {Chien Wu}",

note = "Publisher Copyright: {\textcopyright} 2021 IEEE.",

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doi = "10.1109/ACCESS.2021.3133489",

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T1 - Fully Digital Current Mode Constant On-Time Controlled Buck Converter with Output Voltage Offset Cancellation

AU - Hu, Kai Yu

AU - Yeh, Wei Ting

AU - Tsai, Chien Hung

AU - Tsai, Chien Wu

PY - 2021

Y1 - 2021

N2 - Fully digital current mode constant on-time (COT) control buck converter with output voltage offset cancellation is presented in this paper. Current mode COT can achieve fast transient response and low output voltage ripple with additional current path. To fully digitalize the control loop in this work, both current mode control and the additional current path are implement in digital way. However, the current path may induce inevitable output voltage offset. To ensure effective output voltage regulation within all load current ranges, an output voltage offset cancellation mechanism was proposed. A prototype converter was fabricated using 0.18 μm CMOS process technology. The controller was fully implemented as a standard-cell-based digital circuit. Measurement results indicated the output voltage regulation in full-load range was 2%, and 100 mV output voltage overshoot under 2.5A load transient response.

AB - Fully digital current mode constant on-time (COT) control buck converter with output voltage offset cancellation is presented in this paper. Current mode COT can achieve fast transient response and low output voltage ripple with additional current path. To fully digitalize the control loop in this work, both current mode control and the additional current path are implement in digital way. However, the current path may induce inevitable output voltage offset. To ensure effective output voltage regulation within all load current ranges, an output voltage offset cancellation mechanism was proposed. A prototype converter was fabricated using 0.18 μm CMOS process technology. The controller was fully implemented as a standard-cell-based digital circuit. Measurement results indicated the output voltage regulation in full-load range was 2%, and 100 mV output voltage overshoot under 2.5A load transient response.

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Fully Digital Current Mode Constant On-Time Controlled Buck Converter with Output Voltage Offset Cancellation

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