Second stage calibration in DC/DC LED current regulation

A method of controlling regulation of a current, the method comprising:

• outputting a first stage trim signal;
• outputting a current sense signal based, at least in part, on a differential input signal and the first stage trim signal;
• outputting a second stage trim signal;
• performing a digital-to-analog conversion to output a set signal based, at least in part, on a digital input signal and the second stage trim signal;
• and
• outputting an error signal based, at least in part, on the set signal and the current sense signal, wherein the regulation of the current is based, at least in part, on the error signal.

A method, comprising:

• using an error amplifier of a current regulator controller to output an error signal based, at least in part, on a current sense signal and a set signal;
• calibrating a current sense gain of a differential amplifier circuit of the current regulator controller to determine a first trim value, wherein the differential amplifier circuit is arranged to output the current sense signal;
• and
• calibrating an offset of a digital-to-analog converter to determine a second trim value, wherein the digital-to-analog converter is arranged to output the set signal.