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

  • US 7,301,319 B2
  • Filed: 10/17/2006
  • Issued: 11/27/2007
  • Est. Priority Date: 01/17/2002
  • Status: Expired due to Fees
First Claim
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1. A method of regulating a level at a power supply output, comprising:

  • receiving a control terminal current from a control terminal of a regulator circuit, the control terminal current including a feedback current and an internal supply current;

    deriving 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; and

    determining at least one of a first mode and a second mode of operation in response to a level of the control terminal current to maintain an approximate constant output current characteristic of the power supply.

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