Method and apparatus for maintaining a constant load current with line voltage in a switch mode power supply

  • US 7,834,605 B2
  • Filed: 10/16/2009
  • Issued: 11/16/2010
  • Est. Priority Date: 09/27/2001
  • Status: Active Grant
First Claim
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1. A power supply regulator, comprising:

  • a comparator having a first input coupled to sense a voltage representative of a current flowing through a switch during an on time of the switch, the comparator having a second input coupled to receive a variable current limit threshold that increases during the on time of the switch;

    a feedback circuit coupled to receive a feedback signal representative of an output voltage at an output of a power supply; and

    a control circuit coupled to generate a control signal in response to an output of the comparator and in response to an output of the feedback circuit, the control signal to be coupled to a control terminal of the switch to control switching of the switch.

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