LED controller with compensation for die-to-die variation and temperature drift

A system comprising:

• a selection module configured to
• select one of a plurality of templates corresponding to a plurality of light emitting diodes,
• wherein the selected template includes one or more of temperature, current, and voltage characteristics of the plurality of light emitting diodes;
• a diode in thermal proximity to the plurality of light emitting diodes;
• and
• a control module configured to
• determine a temperature of the plurality of light emitting diodes based on a junction temperature of the diode, and
• in order to maintain a luminosity of the plurality of light emitting diodes at a predetermined luminosity, adjust current through the plurality of light emitting diodes based on (i) the temperature, (ii) the selected template, and (iii) calibration data,
• wherein the calibration data include current through the plurality of light emitting diodes and corresponding luminosities of the plurality of light emitting diodes.

A system comprising:

• a selection module configured to
• select one of a plurality of templates corresponding to a plurality of light emitting diodes connected in series,
• wherein the selected template includes one or more of temperature, current, and voltage characteristics of the plurality of light emitting diodes;
• and
• a control module configured to
• determine a temperature of the plurality of light emitting diodes based on (i) a first voltage across the plurality of light emitting diodes, (ii) a second voltage across one of the plurality of light emitting diodes, and (iii) the selected template, and
• in order to maintain a luminosity of the plurality of light emitting diodes at a predetermined luminosity, adjust current through the plurality of light emitting diodes based on (i) the temperature, (ii) the selected template, and (iii) calibration data,
• wherein the calibration data include current through the plurality of light emitting diodes and corresponding luminosities of the plurality of light emitting diodes.