Arbitrary-ratio analog current division circuit

A device comprising:

• a first current channel including:
• a first sense resistor configured to provide a first sensed voltage, and
• a first voltage control switch configured to control a first light emitting diode (LED) array;
• a second current channel including:
• a second sense resistor configured to provide a second sensed voltage, and
• a second voltage control switch configured to control a second LED array;
• a voltage controlled current source configured to drive the first current channel and the second current channel based on a set voltage;
• and
• a computational circuit configured to increase the set voltage when the first sensed voltage is more than the second sensed voltage and decrease the set voltage when the first sensed voltage is less than the second sensed voltage.

A method of driving light emitting diode (LED) arrays, the method comprising:

• sensing a first sensed voltage of a first current channel comprising a first LED array;
• sensing a second sensed voltage of a second current channel comprising a second LED array;
• comparing the first sensed voltage to the second sensed voltage to determine a set voltage based on one of:
• a difference between the first sensed voltage and the second sensed voltage, or
• a ratio of the first sensed voltage and the second sensed voltage and a control signal;
• and
• driving the first current channel and the second current channel based on the set voltage to:
• when set voltage is determined based on the difference between the first sensed voltage and the second sensed voltage, increase the set voltage when the first sensed voltage is greater than the second sensed voltage and decrease the set voltage when the first sensed voltage is less than the second sensed voltage, and
• when set voltage is determined based on the ratio of the first sensed voltage and the second sensed voltage, adjust the set voltage based on a mapping of the control signal to the ratio.