Load driving device and electrical apparatus using the same

Abstract

A load driving device includes a driver that supplies drive current to a load having an inductance component, a current sensing resistor that generates sensed voltage corresponding to switching current that flows in the driver, a switch circuit that delivers one of the sensed voltage and a predetermined bias voltage selectively, a comparator that compares a selected voltage of the switch circuit with a predetermined reference voltage, and a logic circuit that generates a drive control signal for the driver based on a comparison output signal of the comparator, so as to perform constant-current chopping control of the drive current with improved stability of the constant-current chopping control while avoiding malfunction due to noise.

Dependencies are inferred from the claim text.