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Method and apparatus for maintaining an approximate constant current output characteristic in a switched mode power supply

  • US 6,967,472 B2
  • Filed: 11/12/2004
  • Issued: 11/22/2005
  • Est. Priority Date: 01/17/2002
  • Status: Active Grant
First Claim
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1. A regulator, comprising:

  • a switch coupled between first and second terminals;

    a control circuit coupled to the switch to control a current through the switch; and

    a regulator circuit coupled to the control circuit and to a control terminal, the control terminal coupled to receive a control current including an internal supply current of the regulator and a feedback current, the regulator circuit to adjust a current limit threshold of the switch in response to the feedback current, the control circuit to control the current through the switch in response to the current limit threshold.

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