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Inductor flyback detection using switch gate change characteristic detection

  • US 7,746,043 B2
  • Filed: 12/31/2007
  • Issued: 06/29/2010
  • Est. Priority Date: 05/02/2007
  • Status: Active Grant
First Claim
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1. An apparatus to detect an end of an inductor flyback time interval of a switching power converter, wherein the switching power converter includes an inductor to couple to an input voltage node and a field effect transistor (FET) switch coupled to the inductor, the apparatus comprising:

  • a switch gate sensor to couple to a gate of the switch, wherein during operation of the switch gate sensor, the switch gate sensor is configured to;

    detect a charge characteristic on a gate of the switch associated with an end of the inductor flyback time interval; and

    generate a switch gate sensor signal indicating an end of the inductor flyback time interval.

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