Comparison of State-of-the-Art Digital Control and Analogue Control for High Bandwidth Point of Load Converters

Lars Tønnes Jakobsen, Henrik Schneider, Michael Andreas E. Andersen

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


    The purpose of this paper is to present a comparison of state-of-the-art digital and analogue control for a Buck converter with synchronous rectification. The digital control scheme is based on a digital self-oscillating modulator that allows the sampling frequency to be higher than the switching frequency of the converter. Voltage mode control is used in both the analogue and digital control schemes. The experimental results show that it is possible to design a digitally controlled Buck converter that has the same performance as can be achieved using commercially available analogue control ICs. The performance of the analogue system can however be increased by using a separate operational amplifier as error amplifier. Thus analogue control is still the best option if high control bandwidth and fast transient response to load steps are important design parameters.
    Original languageEnglish
    Title of host publicationApplied Power Electronics Conference
    Publication date2008
    ISBN (Print)978-1-4244-1874-9
    Publication statusPublished - 2008
    Event23rd Applied Power Electronics Conference - Austin, TX, United States
    Duration: 24 Feb 200828 Feb 2008
    Conference number: 23


    Conference23rd Applied Power Electronics Conference
    Country/TerritoryUnited States
    CityAustin, TX
    Internet address


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