Motor driver circuit having reverse current detection mechanism

A motor driver circuit having a reverse current detection mechanism, which is applicable to a motor, comprising:

• a reverse current detector circuit connected to the motor, and configured to detect a current flowing through the motor to output a current detected signal within a preset time interval;
• a control circuit connected to the reverse current detector circuit, configured to determine whether or not the current flowing through the motor is a reverse current according to the current detected signal from the reverse current detector circuit to determine a control signal, and configured to output the control signal;
• a driver circuit connected to the control circuit and configured to output a driving signal according to the control signal from the control circuit;
• and
• an output stage circuit connected to the driver circuit and the motor, and configured to operate for outputting an output-stage signal to the motor according to the driving signal, wherein the motor rotates according to the output-stage signal from the output stage circuit;
• wherein the output stage circuit includes:
• a plurality of high-side transistors including a first high-side transistor and a second high-side transistor, wherein a first terminal of the first high-side transistor and a first terminal of the second high-side transistor are coupled to a common voltage;
• and
• a plurality of low-side transistors including a first low-side transistor and a second low-side transistor, wherein a first terminal of the first low-side transistor is connected to a second terminal of the first high-side transistor, a first terminal of the second low-side transistor is connected to a second terminal of the second high-side transistor, and a second terminal of the first low-side transistor and a second terminal of the second low-side transistor are grounded;
• wherein control terminals of the plurality of high-side transistors and the plurality of low-side transistors are connected to an output terminal of the driver circuit;
• wherein a first terminal of the motor is connected to a node between the first terminal of the first low-side transistor and the second terminal of the first high-side transistor;
• wherein a second terminal of the motor is connected to a node between the first terminal of the second low-side transistor and the second terminal of the second high-side transistor;
• wherein, when the control circuit determines that the reverse current flows through the motor, the control circuit controls the driver circuit to turn off any one of the plurality of low-side transistor.