Communications - Scientific Letters of the University of Zilina 2023, 25(3):C48-C55 | DOI: 10.26552/com.C.2023.054

Node Ringing Reduction of Synchronous Buck Converter

Michal Frivaldský ORCID...1, *, Marcel Pčola2, Zdeno Biel2, Roman Kučera2, Marek Franko ORCID...2, Roman Holček2
1 Faculty of Electrical Engineering and Information Technologies, University of Zilina, Zilina, Slovakia
2 EVPU a.s., Nova Dubnica, Slovakia

This paper discusses the issue related to the switching regulators operated at high switching frequencies, where it is necessary to eliminate the influence of parasitic components of the converter's main circuit. In more detail it deals with the node-ringing phenomena, which is typical for synchronous buck converters. The existence of the parasitic inductances arising from the printed circuit board conductive paths, induce voltages, which are several times higher than nominal input voltage, thus it increases the risk of damage of the power transistors. Therefore, optimization of the circuit is required to reduce the voltage spikes and therefore improve safety margin related to nominal operation. In this paper, node-ringing phenomena is introduced, while the optimization methodologies for its reduction are described and verified by experimental analysis.

Keywords: power transistor, switching noise, parasitics, snubber
Grants and funding:


This publication was realized with support of Operational Program Integrated Infrastructure 2014 - 2020 of the project: Innovative Solutions for Propulsion, Power and Safety Components of Transport Vehicles, code ITMS 313011V334, co-financed by the European Regional Development Fund.

Conflicts of interest:


The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Received: May 24, 2023; Accepted: June 13, 2023; Prepublished online: June 22, 2023; Published: July 11, 2023  Show citation

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Frivaldský, M., Pčola, M., Biel, Z., Kučera, R., Franko, M., & Holček, R. (2023). Node Ringing Reduction of Synchronous Buck Converter. Communications - Scientific Letters of the University of Zilina, 25(3), C48-55. doi: 10.26552/com.C.2023.054
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