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Digital Controlled Multi-phase Buck Converter with Accurate Voltage and Current Control

abstract: A 4-phase, quasi-current-mode hysteretic buck converter with digital frequency synchronization, online comparator offset-calibration and digital current sharing control is presented. The switching frequency of the hysteretic converter is digitally synchronized to the input clock reference with less than ±1.5% error in the switching frequency range of 3-9.5MHz. The online offset calibration cancels the input-referred offset of the hysteretic comparator and enables ±1.1% voltage regulation accuracy. Maximum current-sharing error of ±3.6% is achieved by a duty-cycle-calibrated delay line based PWM generator, without affecting the phase synchronization timing sequence. In light load conditions, individual converter phases can be disabled, and the final stage power converter output stage is segmented for high efficiency. The DC-DC converter achieves 93% peak efficiency for Vi = 2V and Vo = 1.6V. / Dissertation/Thesis / Doctoral Dissertation Electrical Engineering 2017

Identiferoai:union.ndltd.org:asu.edu/item:46206
Date January 2017
ContributorsSun, Ming (Author), Bakkaloglu, Bertan (Advisor), Garrity, Douglas (Committee member), Seo, Jae-sun (Committee member), Kitchen, Jennifer (Committee member), Arizona State University (Publisher)
Source SetsArizona State University
LanguageEnglish
Detected LanguageEnglish
TypeDoctoral Dissertation
Format76 pages
Rightshttp://rightsstatements.org/vocab/InC/1.0/, All Rights Reserved

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