Control circuit for passive braking for DC motor

A control circuit for a DC motor, comprising:

• first and second high-side transistors and first and second low-side transistors coupled to the DC motor in a bridge configuration, wherein the first high-side transistor and the second low-side transistor are turned ON to rotate the DC motor in a clockwise direction and the second high-side transistor and the first low-side transistor are turned ON to rotate the DC motor in a counter-clockwise direction;
• a first pull-up resistor coupled between a voltage supply terminal and a gate terminal of the first low-side transistor;
• a second pull-up resistor coupled between the voltage supply terminal and a gate terminal of the second low-side transistor,
• wherein the first and second pull-up resistors are configured to apply respective bias currents to turn ON the first and second low-side transistors to provide a conductive path across the first and second terminals of the DC motor to brake the DC motor.

A control circuit for a DC motor, comprising:

• a first high-side transistor coupled between a voltage supply terminal and a first terminal of the DC motor;
• a second high-side transistor coupled between the voltage supply terminal and a second terminal of the DC motor;
• a first low-side transistor coupled between a ground terminal and the first terminal of the DC motor;
• a second low-side transistor coupled between the ground terminal and the second terminal of the DC motor;
• fifth and sixth transistors coupled in series across the first and second terminals of the DC motor,
• wherein the fifth and the sixth transistors are turned OFF when the DC motor is powered ON, and wherein the fifth and the sixth transistors are turned ON when the DC motor is disconnected from a voltage supply to provide a conductive path across the first and second terminals of the DC motor to brake the DC motor.

A control circuit, comprising:

• a first high-side NMOS transistor coupled between a voltage supply terminal and a first terminal of a DC motor;
• a second high-side NMOS transistor coupled between the voltage supply terminal and a second terminal of the DC motor;
• a first low-side NMOS transistor coupled between a ground terminal and the first terminal of the DC motor;
• a second low-side NMOS transistor coupled between a ground terminal and the second terminal of the DC motor;
• first and second PMOS transistors coupled in series across the first and second terminals of the DC motor;
• a charge pump coupled to gate terminals of the fifth and sixth PMOS transistors;
• and
• a pull-down resistor coupled between the first terminal of the DC motor and the ground terminal;
• wherein when the DC motor is powered ON, the charge pump applies a charge to the gate terminals of the PMOS transistors to turn OFF the PMOS transistors, and wherein when the DC motor is disconnected from a voltage supply, the PMOS transistors are turned ON to provide a conductive path across the terminals of the DC motor.

An automotive electronic system that is operable to control a DC motor having a first terminal and a second terminal, the automotive electronic system comprising:

• a first transistor having a gate, a source and a drain, the drain is coupled to the first terminal;
• a second transistor having a gate, a source and a drain, the drain is coupled to the second terminal and the source is coupled to the source of the first transistor;
• and
• wherein the first transistor and the second transistor are operable to couple the first terminal to the second terminal.