Disclosed herein is a switching constant-current power supply which comprises:
a switching-system power converter for supplying a predetermined current to a load;
a current detector for generating a feedback signal in correspondence with the
load current; a controller for driving the power converter in correspondence with
the feedback signal; and a feedback circuit, which is provided between the current
detector and the controller, and comprises a signal holding unit, the feedback
circuit supplying either a first feedback signal, output from the current detector,
or a second feedback signal, output from the signal holding unit, to the controller;
the size of the second feedback signal being approximately equal to the first feedback
signal at a given time.
