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TRANSFORMER-ISOLATED LED LIGHTING CIRCUIT WITH SECONDARY-SIDE DIMMING CONTROL

  • US 20130002156A1
  • Filed: 06/29/2012
  • Published: 01/03/2013
  • Est. Priority Date: 07/30/2010
  • Status: Active Grant
First Claim
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1. An integrated circuit for supplying current to one or more light-emitting diodes (LEDs), comprising:

  • an input circuit for coupling to a secondary winding of an external transformer that isolates the integrated circuit and the LEDs from a primary-side circuit that provides pulses through the transformer for supplying energy to the LEDs;

    a decoder coupled to the input circuit for decoding a dimming value encoded in a voltage waveform provided across the secondary winding; and

    a power converter control circuit for controlling a current supplied to the LEDs in conformity with the dimming value.

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