Abstract: A load open state detection circuit includes a driver having X and Y terminals between which an inductive load is connected and which receive drive signals, a first transistor whose base is connected to the X terminal and whose collector is connected to a terminal supplied with a predetermined voltage, a second transistor whose base is connected to the Y terminal and whose collector is connected to the terminal supplied with a predetermined voltage and third and fourth transistors having bases thereof connected to input terminals supplied with respective drive signals. A fifth transistor has a base connected to the base of the first transistor, a collector connected to a resistor which is in turn connected to the collector of the first transistor, and an emitter connected to a second resistor which is connected to the emitter of the first transistor.

Abstract: A load short-circuit state detection circuit has a driver including X and Y terminals between which an inductive load is connected and receiving drive signals. The detection circuit further includes a first transistor whose base is connected to the X terminal and whose collector is supplied with a voltage, a second transistor whose base is connected to the Y terminal and whose collector is also supplied with a voltage, a first constant current circuit connected to an emitter of the first transistor through a first resistor and a second constant current circuit connected to an emitter of the second transistor through a second resistor. A comparator is provided for comparing a voltage of a node between the first resistor and the first constant current circuit with a voltage of a node between the second resistor and the second constant current circuit.