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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 t... (more)
Created Date 2017
Contributor Sun, Ming (Author) / Bakkaloglu, Bertan (Advisor) / Garrity, Douglas (Committee member) / Seo, Jae-sun (Committee member) / Kitchen, Jennifer (Committee member) / Arizona State University (Publisher)
Subject Electrical engineering / Buck / Current Sharing / DC-DC / Hysteretic / Multi-phase / Phase Synchronization
Type Doctoral Dissertation
Extent 76 pages
Language English
Reuse Permissions All Rights Reserved
Note Doctoral Dissertation Electrical Engineering 2017
Collaborating Institutions Graduate College / ASU Library
Additional Formats MODS / OAI Dublin Core / RIS

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Description Dissertation/Thesis