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LED Drivers and Control Methods

  • US 20120139438A1
  • Filed: 12/07/2010
  • Published: 06/07/2012
  • Est. Priority Date: 12/07/2010
  • Status: Active Grant
First Claim
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1. An LED driver comprising:

  • an input for receiving a rectified AC voltage;

    an output for providing an output current;

    a power converter coupled between the input and the output to receive the rectified AC voltage and generate the output current, the power converter including a switch and an inductive element, the switch coupled to the inductive element; and

    a controller for controlling the power converter at a substantially constant frequency to provide the output current and active power factor correction, the controller configured to control an on time of the switch as a function of a current through the inductive element and the rectified AC voltage.

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