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MULTIPHASE DIGITAL CURRENT MODE CONTROLLER WITH DYNAMIC CURRENT ALLOCATION

  • US 20140015500A1
  • Filed: 07/12/2012
  • Published: 01/16/2014
  • Est. Priority Date: 07/12/2012
  • Status: Active Grant
First Claim
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1. A method of operating a multiphase switching regulator having a power stage with at least a first phase and a second phase for supplying power to a load through inductors coupling the phases to the load, the method comprising:

  • switching the first phase at a higher switching frequency than the second phase via pulse width modulation (PWM) signals provided to the phases;

    generating a phase-specific target current for each phase at the switching frequency for that phase based on the difference between an output voltage of the power stage and a reference voltage;

    sensing the current in the inductors coupling the phases to the load; and

    adjusting a duty cycle of the PWM signal provided to each phase based on the phase-specific target current and sensed inductor current for that phase.

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