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Multi-threshold multi-gain active transient response circuit and method for digital multiphase pulse width modulated regulators

  • US 8,049,482 B2
  • Filed: 12/15/2010
  • Issued: 11/01/2011
  • Est. Priority Date: 09/10/2004
  • Status: Active Grant
First Claim
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1. In a multiphase pulse-width modulated voltage regulator system providing synchronous pulse width modulated pulses for regulating voltage at a load, a method of detecting deviations from a pre-determined output voltage level comprising the steps of:

  • setting a threshold at which a deviation from the pre-determined voltage level in a first direction is detected;

    setting multiple thresholds at which deviations from the desired voltage in a second direction are detected;

    detecting when one or more of the multiple thresholds has been exceeded; and

    providing an output that is adjusted in accordance with the number of multiple thresholds that have been exceeded wherein providing the adjusted output comprises;

    detecting a current at an output stage of the pulse-width modulated voltage regulator system;

    providing the detected current to a filter; and

    adjusting, a bandwidth of the filter when detecting that one or more of the multiple thresholds has been exceeded.

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