Load controller

A load controller, comprising:

• a first input circuit which detects that a drive instruction signal by the operation of a drive instructing unit is less or equal to a first input threshold value;
• a first constant current source activated in accordance with a detection by the first input circuit;
• a first constant control signal supply unit that is activated by the first constant current source and supplies a first constant control signal;
• a second constant control signal supply unit that supplies a second constant control signal in accordance with the activation of a second constant current source during the failure of the first input circuit or the first constant current source;
• a drive control unit that generates a constant drive control signal in accordance with the first constant control signal supplied from the first constant control signal supply unit or the second constant control signal supplied from the second constant control signal supply unit;
• and
• a load driving element that is controlled by the constant drive control signal supplied from the drive control unit so as to drive a load.