INDUCTIVE LOAD CONTROLLER

PROBLEM TO BE SOLVED: To provide an inexpensive inductive load controller capable of accurately controlling the current of an inductive load in a wide range. SOLUTION: In a device comprising a transistor for drive provided in the energizing route of a solenoid, a resistor for current detection provided in the energizing route of the solenoid and an amplifier circuit for amplifying and outputting the both-terminal voltage of the resistor for performing the current feedback control of calculating the current (load current) flowing to the solenoid from the output voltage of the amplifier circuit and controlling the duty ratio of the drive signals of the transistor so that the calculated load current becomes a target current, in the case that the target current enters a current range wherein the output voltage of the amplifier circuit and the load current are not proportional (S120 or S130:NO), the open control is implemented of setting the duty ratio for making the load current at the target current on the basis of the relation of the load current and the duty ratio stored at the time of performing the feedback control independent of the detected value of the load current (S150). COPYRIGHT: (C)2006,JPO&NCIPI