Patent ID: 7642725

Claim:
Light emitting diode driver circuitry, comprising: A. a first lead adapted to be connected to the cathode of at least one first light emitting diode; B. a second lead adapted to be connected to the cathode of at least one second light emitting diode, which is different than the first light emitting diode, and the number of light emitting diodes to be connected to the second lead being different than the number of light emitting diodes to be connected to the first lead; C. a third lead connected to circuit ground through a resistor; D. first current source circuitry selectively connecting the first lead to the third lead and having a control voltage input and a select input; E. second current source circuitry selectively connecting the second lead to the third lead and having a control voltage input and a select input; F. differential amplifier circuitry having one input connected to a reference voltage, another input connected to the third lead, and a control voltage output connected to the control voltage input of the first current source circuitry and the second current source circuitry; and G. selection circuitry having a first select output connected to the select input of the first current source circuitry and a second select output connected to the select input of the second current source circuitry.