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DC-DC converter current sensing

  • US 8,571,492 B2
  • Filed: 11/04/2011
  • Issued: 10/29/2013
  • Est. Priority Date: 04/20/2010
  • Status: Active Grant
First Claim
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1. Circuitry comprising:

  • a sample-and-hold (SAH) current estimating circuit adapted to sample a voltage across a series switching element during an ON state of the series switching element and during a ramping signal peak to provide an SAH output signal based on an estimate of an output current of a first switching power supply output signal; and

    a first switching power supply comprising the series switching element and adapted to;

    provide the first switching power supply output signal based on the series switching element and a setpoint; and

    select the ON state of the series switching element, such that during the ramping signal peak, the series switching element has a series current having a magnitude, which is about equal to a magnitude of the output current.

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