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Method and apparatus to limit output power in a switching power supply

  • US 20070007938A1
  • Filed: 07/11/2005
  • Published: 01/11/2007
  • Est. Priority Date: 07/11/2005
  • Status: Active Grant
First Claim
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1. A switching regulator circuit, comprising:

  • a switch to be coupled to an energy transfer element of a power supply;

    a controller to generate a drive signal coupled to control switching of the switch to regulate an output of the power supply;

    a current limiter included in the controller to adjust the drive signal to limit a current through the switch to a variable current limit value, wherein the variable current limit value is set by the current limiter in response to an input line voltage to be coupled to the energy transfer element.

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