LOCK PROTECTING CIRCUIT OF MOTOR, CAPABLE OF ELIMINATING THE NECESSITY OF USING EXTERNALLY ATTACHED CONDENSER BY DETECTING LOCK STATE OF MOTOR THROUGH COUNTING OF START PULSES, INTEGRATED CIRCUIT, AND METHOD FOR PROTECTING LOCK OF MOTOR

摘要

PURPOSE: A lock protecting circuit, an integrated circuit, and a method are provided to reduce an area occupied by a circuit and costs by eliminating the necessity of using an externally attached condenser. CONSTITUTION: A lock protecting circuit comprises a start pulse measuring unit for counting start pulses; a lock state detection unit for detecting lock state of a motor in accordance with the result of the counting performed by the start pulse measuring unit; and a drive coil current cut-off control unit for controlling cut-off of the current being supplied to a drive coil when the lock state is detected.