Load control device having a wide output range

A light-emitting diode (LED) control method, comprising:

• receiving, by an LED control circuit, an input that includes a target intensity;
• determining, by the LED control circuit, a target load current to provide the target intensity;
• determining, by the LED control circuit, whether the target intensity is less than a defined threshold intensity;
• responsive to a determination by the LED control circuit that the target intensity is below the defined threshold intensity:
• generating, by the LED control circuit, a first current control signal to cause an LED drive circuit operatively coupled to the LED control circuit to output a load current at a minimum target current;
• communicating, by the LED control circuit, a first frequency control signal to cause an operatively coupled latch circuit to generate a first output signal, the first output signal to cause the LED drive circuit to output an operating frequency between a minimum operating frequency and a maximum operating frequency based on the received target intensity;
• causing, by the LED control circuit, a filter circuit operatively coupled to the LED control circuit to sample an instantaneous current feedback signal received from the LED drive circuit synchronous with the output operating frequency to determine an average load current;
• and
• adjusting, by the LED control circuit, the first frequency control signal based on the determined average load current and the determined target load current.

A non-transitory, machine-readable, storage device that includes instructions that when executed by a light-emitting diode (LED) control circuit, cause the LED control circuit to:

• receive an input that includes a target intensity;
• determine a target load current to provide the target intensity;
• determine whether the target intensity is less than a defined threshold intensity;
• responsive to a determination by the LED control circuit that the target intensity is below the defined threshold intensity:
• generate a first current control signal to cause an LED drive circuit operatively coupled to the LED control circuit to output a load current at a minimum target current;
• communicate a first frequency control signal to cause an operatively coupled latch circuit to generate a first output signal, the first output signal to cause the LED drive circuit to output an operating frequency between a minimum operating frequency and a maximum operating frequency based on the received target intensity;
• cause a filter circuit operatively coupled to the LED control circuit to sample an instantaneous current feedback signal received from the LED drive circuit synchronous with the output operating frequency to determine an average load current;
• and
• adjust the first frequency control signal based on the determined average load current and the determined target load current.