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Design of voltage-mode hysteretic controllers for synchronous buck converters supplying microprocessor loads

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5 Author(s)
M. Castilla ; Dept. d'Enginyeria Electron., Univ. Politecnica de Catalunya, Vilanova I La Geltru, Spain ; L. Garcia de Vicuna ; J. M. Guerrero ; J. Matas
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The use of voltage-mode hysteretic control is a popular way to power modern microprocessor loads having high slew-rate current transients. A simple methodology is presented for the control design of synchronous buck hysteretic regulators based on sliding-mode control theory. The major advantage of this design approach is that the large-signal dynamic model of the hysteretic regulator can be expressed in close-loop operation as a linear system, thanks to which regular linear control techniques can be easily employed to check stability and to impose a satisfactory transient as well as steady-state performance. A detailed design example and experimental results are reported, confirming the validity of the proposed control design methodology.

Published in:

IEE Proceedings - Electric Power Applications  (Volume:152 ,  Issue: 5 )