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Method and apparatus for a control circuit responsive to an impedance coupled to a control circuit terminal

  • US 8,582,327 B2
  • Filed: 07/19/2012
  • Issued: 11/12/2013
  • Est. Priority Date: 10/04/2006
  • Status: Expired due to Fees
First Claim
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1. A method, in a power supply controller, of responding to an increase in current through a terminal of the power supply controller, the method comprising:

  • regulating the terminal to a first voltage level;

    sensing a magnitude of a first current through the terminal while the controller is regulating the terminal to the first voltage level;

    providing an initial response by the power supply controller in response to the magnitude of the first current exceeding a first threshold current level;

    regulating the terminal to a second voltage level after the magnitude of the first current exceeds the first threshold current level;

    sensing a magnitude of a second current through the terminal while the controller is regulating the terminal to the second voltage level; and

    determining a final response of the power supply controller in response to the magnitude of the second current.

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