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Design and Stability Analysis of a Frequency Controlled Sliding-Mode Buck Converter

Abstract : Power management of mobile digital systems-on-chip necessitates large voltage regulation performances. DC/DC converters used to supply digital cores are facing stringent constraints with respect to load transients, reference tracking and accuracy. The fast transient response offered by sliding-mode control is well suited to DC/DC converters with fast varying load. Fixed switching-frequency is also mandatory for EMI and noise related issues. Fixed-switching frequency sliding-mode control has been experimented as a multi-loop system. There is a necessity to investigate the stability when multi-loops interact and the parameter set for each loop is quite large. The paper details a methodology for the stability analysis of a frequency-controlled sliding-mode DC/DC converter. The proposed stability analysis takes the possible cross-interactions into account and can be used to optimise the DC/DC controller without the limitations of a non-interaction criterion. As a verification a DC/DC converter is implemented in CMOS 130 nm. Experimental results agree with the analysis main recommendations.
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Contributor : Xuefang Lin-Shi <>
Submitted on : Thursday, January 17, 2019 - 4:01:18 PM
Last modification on : Tuesday, January 5, 2021 - 12:32:03 PM



Benoît Labbe, Bruno Allard, Xuefang Lin-Shi. Design and Stability Analysis of a Frequency Controlled Sliding-Mode Buck Converter. IEEE Transactions on Circuits and Systems I: Regular Papers, IEEE, 2014, 61 (9), pp.2761-2770. ⟨10.1109/TCSI.2014.2333291⟩. ⟨hal-01985120⟩



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