A digital dc-dc buck converter with adaptive on-time PWM/PFM control

Chun Hsiao Teng, Chien-Hung Tsai

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A buck converter with digital adaptive on-time (AOT) control that achieves a fast load transient response is proposed in this paper. The proposed digital inductor current ramp estimator circuit can not only allow the switching regulator to achieve a fast transient response, but also operate stably without a high cost output voltage sampling analog-to-digital converter (ADC). The digital AOT controller which adjusting the on-time according to the supply voltage and different reference voltage conditions can achieve pseudo-fixed switching frequency in the continuous conduction mode (CCM). And the conversion efficiency under ultralight-load conditions can be improved by working in the discontinuous conduction mode (DCM). The measurement results show that the buck converter can operate under load current between 10 mA and 600 mA for the supply voltage from 2.7V to 4.2 V and the output voltage range from 0.8 V to 1.2 V. The recovery time is 30 μs when the load current varies from 10 mA to 600 mA. The peak efficiency is 94.66 % at 50 mA.

Original languageEnglish
Title of host publicationProceedings - 2014 IEEE 12th International Conference on Solid-State and Integrated Circuit Technology, ICSICT 2014
EditorsJia Zhou, Ting-Ao Tang
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479932962
DOIs
Publication statusPublished - 2014 Jan 23
Event2014 12th IEEE International Conference on Solid-State and Integrated Circuit Technology, ICSICT 2014 - Guilin, China
Duration: 2014 Oct 282014 Oct 31

Publication series

NameProceedings - 2014 IEEE 12th International Conference on Solid-State and Integrated Circuit Technology, ICSICT 2014

Other

Other2014 12th IEEE International Conference on Solid-State and Integrated Circuit Technology, ICSICT 2014
CountryChina
CityGuilin
Period14-10-2814-10-31

Fingerprint

Pulse width modulation
Electric potential
Transient analysis
Switching frequency
Digital to analog conversion
Conversion efficiency
Sampling
Recovery
Controllers
Networks (circuits)
Costs

All Science Journal Classification (ASJC) codes

  • Hardware and Architecture
  • Electrical and Electronic Engineering
  • Computer Science Applications

Cite this

Teng, C. H., & Tsai, C-H. (2014). A digital dc-dc buck converter with adaptive on-time PWM/PFM control. In J. Zhou, & T-A. Tang (Eds.), Proceedings - 2014 IEEE 12th International Conference on Solid-State and Integrated Circuit Technology, ICSICT 2014 [7021467] (Proceedings - 2014 IEEE 12th International Conference on Solid-State and Integrated Circuit Technology, ICSICT 2014). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ICSICT.2014.7021467
Teng, Chun Hsiao ; Tsai, Chien-Hung. / A digital dc-dc buck converter with adaptive on-time PWM/PFM control. Proceedings - 2014 IEEE 12th International Conference on Solid-State and Integrated Circuit Technology, ICSICT 2014. editor / Jia Zhou ; Ting-Ao Tang. Institute of Electrical and Electronics Engineers Inc., 2014. (Proceedings - 2014 IEEE 12th International Conference on Solid-State and Integrated Circuit Technology, ICSICT 2014).
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abstract = "A buck converter with digital adaptive on-time (AOT) control that achieves a fast load transient response is proposed in this paper. The proposed digital inductor current ramp estimator circuit can not only allow the switching regulator to achieve a fast transient response, but also operate stably without a high cost output voltage sampling analog-to-digital converter (ADC). The digital AOT controller which adjusting the on-time according to the supply voltage and different reference voltage conditions can achieve pseudo-fixed switching frequency in the continuous conduction mode (CCM). And the conversion efficiency under ultralight-load conditions can be improved by working in the discontinuous conduction mode (DCM). The measurement results show that the buck converter can operate under load current between 10 mA and 600 mA for the supply voltage from 2.7V to 4.2 V and the output voltage range from 0.8 V to 1.2 V. The recovery time is 30 μs when the load current varies from 10 mA to 600 mA. The peak efficiency is 94.66 {\%} at 50 mA.",
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Teng, CH & Tsai, C-H 2014, A digital dc-dc buck converter with adaptive on-time PWM/PFM control. in J Zhou & T-A Tang (eds), Proceedings - 2014 IEEE 12th International Conference on Solid-State and Integrated Circuit Technology, ICSICT 2014., 7021467, Proceedings - 2014 IEEE 12th International Conference on Solid-State and Integrated Circuit Technology, ICSICT 2014, Institute of Electrical and Electronics Engineers Inc., 2014 12th IEEE International Conference on Solid-State and Integrated Circuit Technology, ICSICT 2014, Guilin, China, 14-10-28. https://doi.org/10.1109/ICSICT.2014.7021467

A digital dc-dc buck converter with adaptive on-time PWM/PFM control. / Teng, Chun Hsiao; Tsai, Chien-Hung.

Proceedings - 2014 IEEE 12th International Conference on Solid-State and Integrated Circuit Technology, ICSICT 2014. ed. / Jia Zhou; Ting-Ao Tang. Institute of Electrical and Electronics Engineers Inc., 2014. 7021467 (Proceedings - 2014 IEEE 12th International Conference on Solid-State and Integrated Circuit Technology, ICSICT 2014).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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N2 - A buck converter with digital adaptive on-time (AOT) control that achieves a fast load transient response is proposed in this paper. The proposed digital inductor current ramp estimator circuit can not only allow the switching regulator to achieve a fast transient response, but also operate stably without a high cost output voltage sampling analog-to-digital converter (ADC). The digital AOT controller which adjusting the on-time according to the supply voltage and different reference voltage conditions can achieve pseudo-fixed switching frequency in the continuous conduction mode (CCM). And the conversion efficiency under ultralight-load conditions can be improved by working in the discontinuous conduction mode (DCM). The measurement results show that the buck converter can operate under load current between 10 mA and 600 mA for the supply voltage from 2.7V to 4.2 V and the output voltage range from 0.8 V to 1.2 V. The recovery time is 30 μs when the load current varies from 10 mA to 600 mA. The peak efficiency is 94.66 % at 50 mA.

AB - A buck converter with digital adaptive on-time (AOT) control that achieves a fast load transient response is proposed in this paper. The proposed digital inductor current ramp estimator circuit can not only allow the switching regulator to achieve a fast transient response, but also operate stably without a high cost output voltage sampling analog-to-digital converter (ADC). The digital AOT controller which adjusting the on-time according to the supply voltage and different reference voltage conditions can achieve pseudo-fixed switching frequency in the continuous conduction mode (CCM). And the conversion efficiency under ultralight-load conditions can be improved by working in the discontinuous conduction mode (DCM). The measurement results show that the buck converter can operate under load current between 10 mA and 600 mA for the supply voltage from 2.7V to 4.2 V and the output voltage range from 0.8 V to 1.2 V. The recovery time is 30 μs when the load current varies from 10 mA to 600 mA. The peak efficiency is 94.66 % at 50 mA.

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Teng CH, Tsai C-H. A digital dc-dc buck converter with adaptive on-time PWM/PFM control. In Zhou J, Tang T-A, editors, Proceedings - 2014 IEEE 12th International Conference on Solid-State and Integrated Circuit Technology, ICSICT 2014. Institute of Electrical and Electronics Engineers Inc. 2014. 7021467. (Proceedings - 2014 IEEE 12th International Conference on Solid-State and Integrated Circuit Technology, ICSICT 2014). https://doi.org/10.1109/ICSICT.2014.7021467