Patent ID: 6762576
Filing Date: 2004-07-13
Classification: H02M,Y02B

Abstract:
A motor driving device comprising:a first output transistor through which a driving current flows to a stator coil of a motor in a case where the first output transistor is set to an on-state; a first transistor switch for setting the first output transistor to the on-state in response to a first driving pulse and setting the first output transistor to an off-state in response to no reception of the first driving pulse; a second output transistor which is set to an on-state in response to a second driving pulse, of which a timing differs from that of the first driving pulse, and is set to an off-state in response to no reception of the second driving pulse and through which another driving current flowing from the stator coil of the motor is output to a ground during the on-state of the second output transistor; a voltage clamp circuit for releasing charge of a high voltage, which is generated in a line between the first output transistor and the second output transistor when both the first output transistor and the second output transistor are set to the off-state together, from the line as a clamp current; and a constant current circuit for controlling the clamp current of the voltage clamp circuit to a low value.