MOTOR DRIVING OVERCURRENT DETECTION CIRCUIT, MOTOR DRIVING CIRCUIT FREE OF VOLTAGE LOSS OF HEAD ROOM, AND OVERCURRENT DETECTION METHOD FOR MOTOR DRIVING CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide a motor driving overcurrent detection circuit and a method thereof that can improve efficiency of a motor and reduce distortion of a signal.SOLUTION: A motor driving overcurrent detection circuit includes: a motor driving part 10 which includes a source type switching element group 11 and a sink type switching element group 13, and performs switching operation with a driving control signal to drive a motor M; a distribution sense part 30 which includes a sense resistance connected in series to a distribution switching element, distributes a sensing current with a current flowing through the motor M, and detects the distributed current through the sensor resistance; and an ON resistance holding part 50 which turns ON a distribution switching element connected in parallel to a sink type switching element to be turned ON in the sink type switching element group 13, and holds an ON resistance of the distribution switching element having been turned ON.