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

  • US 20030132738A1
  • Filed: 01/16/2003
  • Published: 07/17/2003
  • Est. Priority Date: 01/17/2002
  • Status: Active Grant
First Claim
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1. A regulator, comprising:

  • a switch having a current limit threshold, the switch coupled between first and second terminals;

    a control circuit coupled to the switch to control a current through the switch in response to the current limit threshold; and

    a control terminal regulator circuit coupled to the control circuit and to a control terminal of the regulator, the control terminal coupled to receive a control terminal current including an internal supply current, the regulator circuit including a shunt regulator coupled to the control terminal to derive a shunt regulator current from the control terminal current, wherein the shunt regulator current is the control terminal current in excess of the internal supply current, wherein the current limit threshold is increased in response to an increase in the shunt regulator current.

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