{"title":"DC IR Drop Steady State Estimate for Cascaded Switching Regulators","authors":"Robin Sercu, H. Barnes","doi":"10.1109/SPI57109.2023.10145542","DOIUrl":null,"url":null,"abstract":"Calculating the DC IR drop for a power distribution network with cascaded dc-dc converters presents some unique challenges. The buck regulator dc-dc converters have a very dynamic large signal switching behavior that is load dependent and must be averaged to DC for the DC IR drop calculation. When cascading multiple regulators in series, the downstream regulator acts as the load for the upstream regulator. An iterative approach can be used to calculate the state of the final regulator stage for a given sink load, and then use this regulator's input current as the sink for the calculation of the DC state of the upstream regulator. This iterative approach with a simplified model for the DC regulator can be as much as $40\\mathrm{x}$ faster than solving in the transient domain.","PeriodicalId":281134,"journal":{"name":"2023 IEEE 27th Workshop on Signal and Power Integrity (SPI)","volume":"41 6 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2023-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2023 IEEE 27th Workshop on Signal and Power Integrity (SPI)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/SPI57109.2023.10145542","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
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Abstract
Calculating the DC IR drop for a power distribution network with cascaded dc-dc converters presents some unique challenges. The buck regulator dc-dc converters have a very dynamic large signal switching behavior that is load dependent and must be averaged to DC for the DC IR drop calculation. When cascading multiple regulators in series, the downstream regulator acts as the load for the upstream regulator. An iterative approach can be used to calculate the state of the final regulator stage for a given sink load, and then use this regulator's input current as the sink for the calculation of the DC state of the upstream regulator. This iterative approach with a simplified model for the DC regulator can be as much as $40\mathrm{x}$ faster than solving in the transient domain.
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