Optimized power management in RGB drivers with multiplexing

A circuit comprising:

• a driving circuit comprising:
• a plurality of switches;
• a plurality of current sources;
• and
• a measuring circuit comprising a plurality of sensing terminals;
• a first dissipative circuit element coupled between a first switch of the plurality of switches and a first sensing terminal of the measuring circuit;
• a first light-emitting diode (LED) coupled between the first sensing terminal and a second sensing terminal of the measuring circuit, wherein the first LED has a first terminal voltage, and wherein the second sensing terminal of the measuring circuit is coupled to a first current source of the plurality of current sources;
• a second LED coupled between the first switch and a third sensing terminal of the measuring circuit, wherein the second LED has a second terminal voltage greater the first terminal voltage, and wherein the third sensing terminal of the measuring circuit is coupled to a second current source of the plurality of current sources;
• and
• a third LED coupled between a fourth sensing terminal and a fifth sensing terminal of the measuring circuit, wherein the third LED has a third terminal voltage greater the first terminal voltage, and wherein the fifth sensing terminal of the measuring circuit is coupled to a third current source of the plurality of current sources.

A method of operating a circuit comprising a measuring circuit, a first light-emitting diode (LED) coupled between a first sensing terminal and a second sensing terminal of the measuring circuit, a second LED coupled between the first sensing terminal and a third sensing terminal of the measuring circuit, and a first dissipative circuit element coupled in series with the first LED between the first sensing terminal and the second sensing terminal of the measuring circuit, a terminal between the first dissipative circuit element and the first LED being coupled to a fourth sensing terminal of the measuring circuit, wherein the second LED has a greater terminal voltage than the first LED, the method comprising:

• measuring a voltage drop across the first LED using the second sensing terminal and the fourth sensing terminal of the measuring circuit;
• determining a temperature of the first LED based on the measured voltage drop across the first LED;
• and
• calibrating a color of the first LED by adjusting a current through the first LED based on the determined temperature of the first LED.