Controlling the output voltage of a power supply involve determining a remote load coupled to the power supply and setting the output voltage based on the determined remote load and a predetermined maximum current for the power supply. The remote load may be measured, for example, by applying a predetermined current to the load, measuring the voltage across the load, and computing the effective load (resistance) value based on the supplied current and the measured voltage. Such measurement may be done using an analog-to-digital converter.