Circuitry for current regulated, externally controlled led driving

A circuit configured for current regulating of a light emitting diode (LED), the circuit comprising:

• a microcontroller configured to generate an output voltage, wherein the output voltage of the microcontroller is configured to incorporate pulse width modulation (PWM);
• a current driver including an input node and an output node and configured to receive an input current and to drive an output current, wherein the output current is multiple times the input current, and wherein a reference voltage (VREF) is supplied at the input node of the current driver;
• a resistor coupled to the output voltage of the microcontroller from a first end and to the input node of the current driver from a second end, wherein the input current is a difference of the output voltage of the microcontroller and the VREF divided by a resistor value, and wherein the resistor value is configured to adjust the input current and the output current of the current driver;
• and
• an LED coupled to the output node of the current driver, wherein the current driver is configured to drive the output current from the LED, and wherein the resistor value is configured to adjust a maximum current of the LED, and wherein an average current of the LED is adjusted by the PWM.

A method configured for current regulating of a light emitting diode (LED) by a circuit including a voltage source and a current driver, the method comprising:

• generating a reference voltage (VREF) by the current driver, the current driver including an input node and an output node, wherein the input node is coupled to a first end of a resistor;
• applying the VREF to the input node of the current driver;
• supplying an input voltage by the voltage source to a second end of the resistor;
• delivering an input current to the input node of the current driver, wherein the input current is a difference of the input voltage and the VREF divided by a resistor value;
• driving an output current from the output node of the current driver coupled to the LED, the output current is multiple times the input current;
• controlling a maximum current of the LED by adjusting the resistance value;
• and
• controlling an average current of the LED by incorporating pulse width modulation (PWM) on the input voltage.