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Bulletin of the Polish Academy of Sciences Technical Sciences

The Journal of Polish Academy of Sciences

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Volume 60, Issue 4 (Dec 2012)


Output characteristics of step-down (Buck) power converter

W. Janke
  • Corresponding author
  • Division of Electronic Systems, Technical University of Koszalin, 2 Śniadeckich St., 75-453 Koszalin, Poland
  • Email:
/ M. Bączek
  • Division of Electronic Systems, Technical University of Koszalin, 2 Śniadeckich St., 75-453 Koszalin, Poland
/ M. Walczak
  • Division of Electronic Systems, Technical University of Koszalin, 2 Śniadeckich St., 75-453 Koszalin, Poland
Published Online: 2013-02-14 | DOI: https://doi.org/10.2478/v10175-012-0086-6


The output characteristics of switched-mode dc-dc buck power converter are discussed. The shape of output characteristics is especially important for converters used for supplying modern processors. An output impedance is usually used for description of output characteristics. Many efforts are described in the literature to obtain the satisfastory features of closed-loop output impedance. Another approach, presented in the paper, is based on the concept of the output voltage response corresponding to the load conductance change, and is expressed by hr transmittance. Simulations of output characteristics of the buck converter in frequency and in time-domain have been performed for the ideal case as well as for a more realistic situation, with the parasitic resistances of converter elements included. The measurement results differ substantially from characteristics calculated for an ideal converter and are in good consistency with simulations including parasitics.

Keywords : DC-DC converters; output characteristics; load transients

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About the article

Published Online: 2013-02-14

Published in Print: 2012-12-01

Citation Information: Bulletin of the Polish Academy of Sciences: Technical Sciences, ISSN (Print) 0239-7528, DOI: https://doi.org/10.2478/v10175-012-0086-6. Export Citation

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