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Dimmable offline LED driver

  • US 8,680,784 B2
  • Filed: 06/15/2011
  • Issued: 03/25/2014
  • Est. Priority Date: 06/15/2010
  • Status: Active Grant
First Claim
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1. A dimmable LED driver apparatus comprising:

  • an input interface coupled to a power source and dimmer, the input interface receives an input voltage from the power source and dimmer;

    a sensor coupled to the power source and dimmer, the sensor detects a first voltage on the input voltage and generates a sensed voltage signal representative of a voltage drop on the input voltage caused by a dimmer;

    a control loop coupled to receive the sensed voltage and compare the sensed voltage to a first threshold level and a second threshold level, the control loop generating a control signal based on a comparison of the sensed voltage to the first threshold level and the second threshold level;

    a regulator and control block coupled to receive the control signal, the regulator and control block generates an LED driver signal based at least in part on the control signal; and

    an output interface comprising a capacitor, the LED driver signal is provided to an LED array at the output interface.

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