A power supply margin controller may alter the voltage of a control signal
used to control the output voltage of a power supply. The controller may
include a digital-to-analog converter having an input and an output, and
a comparator having a first input coupled to receive the control signal,
a second input coupled to the output of the digital-to-analog converter,
and an output. The controller may include a processing system configured
to deliver data to the input of the digital-to-analog converter based on
the output from the comparator that causes signals at the inputs to the
comparator to be substantially equal.