A converter coupled to a DC voltage input and connectable to a load,
includes a signal responsive switch coupled between a first circuit point
and a second circuit point. In lieu of burst mode operation during low
load conditions, the peak switch current is varied directly with load
condition and a switch deactivation interval is varied inversely with
load condition. The switch deactivation level is within a maximum level
to avoid audio frequency band interference, while maintaining high
efficiency operation throughout the load range.