Pseudo AC current synthesizer and DC offset-corrected technique in constant-on-time control buck converter for werable electronics

Jui Che Su, Wei Chung Chen, Wei Tin Lin, Ying Wei Chou, Meng Wei Chien, Chin Long Wey, Ke-Horng Chen, Ying Hsi Lin, Chao Cheng Lee, Shian Ru Lin, Tsung Yen Tsai

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

Constant-on-time (COT) control with an additional current feedback in conventional buck converter has the advantage of using low equivalent series resistance (ESR) output capacitor. Unfortunately, the disadvantage is output voltage regulation accuracy is greatly deteriorated by its DC offset voltage from the current feedback. More seriously, opposite reaction between output voltage and the additional current feedback signal deteriorates transient response. In this paper, pseudo AC current synthesizer and DC voltage offset correction technique are proposed to reduce load-dependent DC offset voltage for improving load regulation. Furthermore, the transient enhancement technique instantly extends on-time and the off-time periods in load change. Test chip fabricated in UMC 28nm CMOS process demonstrated that offset voltage is improved from 65mV to 4mV. Besides, the transient response can be improved to 4μs and 5μs when load changes from 0. 3 to 1.7A and vice versa, respectively. The advantages of compact size, low cost, and high performance power management can maintain wearable electronics small volume, light, and sustainable.

Original languageEnglish
Title of host publication2015 IEEE Asian Solid-State Circuits Conference, A-SSCC 2015 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781467371919
DOIs
StatePublished - 19 Jan 2016
Event11th IEEE Asian Solid-State Circuits Conference, A-SSCC 2015 - Xiamen, Fujian, China
Duration: 9 Nov 201511 Nov 2015

Publication series

Name2015 IEEE Asian Solid-State Circuits Conference, A-SSCC 2015 - Proceedings

Conference

Conference11th IEEE Asian Solid-State Circuits Conference, A-SSCC 2015
CountryChina
CityXiamen, Fujian
Period9/11/1511/11/15

Keywords

  • Conventional constant-on-time (COT) control
  • DC voltage offset correction technique
  • equivalent series resistance (ESR)
  • pseudo AC current synthesizer

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