In a switched-mode buck power converter, superior regulation with excellent transient response is provided when per-cycle energy demand is determined and balanced with per-cycle inductive energy supply to control per-cycle inductive energy charging. Such per cycle inductive energy calculation is improved through the prediction of pedestal energy during operating periods of Continuous Conduction Mode (CCM). Further, recovery from severe transients sometimes straddles multiple chopping cycles. Such recovery is best obtained by preserving energy balance information from one or more un-recovered chopping cycles, to be used to restore energy balance in subsequent cycles. Significant improvement over prior art converters may be obtained even when the energy balance data used for control and recovery are imprecise approximations of true energy demand and supply.;This invention provides control circuitry and a method for using energy balance information to better control a buck converter, with the further improvements of pedestal energy prediction and extension of energy balance over multiple chopping cycles, and for using said circuitry and methods to maintain stability and recover from transients more reliably than in the prior art.
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