A3966SLBTR

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PMIC - Motor Drivers, Controllers are a class of products designed to regulate the performance of motors and other powered devices. The A3966SLBTR is one of these products. This application note introduces the A3966SLBTR, describes its application field and working principle.

Overview

The A3966SLBTR is a full-bridge motor driver designed to drive brushless DC motors up to 150 W at voltages up to 80 V. It provides a high current (1.2 A peak) low-voltage output for applications such as computer peripherals, small appliances, and automotive subsystems. The A3966SLBTR is based on a monolithic half bridge IC with integrated N-channel MOSFETs. It includes a pre-driver with enhanced slew rate, current-sense amplifier, current-limit comparator, and independent logic inputs. Dual PWM inputs allow full bridge motor driving, while active braking and adjustable current-limit protection make it suitable for driving brushless DC motors.

Application Field

The A3966SLBTR is mainly used in computer peripherals, small appliances, and automotive subsystems. It can be used for driving brushless DC motors for applications such as robotic arms, electric scooters, and exercise equipment. The device is also suitable for applications where precise current control is needed, such as digital servo motors, and electric power-steering systems. It can also be used to drive motors in applications such as relays, solenoids, and buzzers that require high current outputs.

Working Principle

The A3966SLBTR works by using a pair of PWM inputs to modulate the voltage of the output signal. The device can be operated in a full-bridge configuration, which enables the motors to be driven in both directions. PWM signal is applied to the A3966SLBTR, which translates it into a voltage signal. The voltage signal is then amplified and used to drive the MOSFETs of the full-bridge circuit. The full-bridge circuit provides high current and voltage to drive the motor load, while the PWM signal modulates the voltage of the output signal based on the desired speed.

The device also includes several protection features, such as current-sensing and active-braking. These features protect the motor from over-current and stalling. The current-sensing feature monitors the current draw of the motor and can be used to limit the output of the device. The active-braking feature enables the user to quickly stop the motor in case of an emergency. Additionally, the A3966SLBTR also includes an adjustable current-limit for applications with tight current control.

Conclusion

The A3966SLBTR is a full-bridge motor driver designed to drive brushless DC motors up to 150 W at voltages up to 80 V. Its dual-PWM inputs allow full bridge motor driving, while active braking and adjustable current-limit protection make it suitable for driving brushless DC motors. The device is mainly used in computer peripherals, small appliances, and automotive subsystems, but can also be used in applications where precise current control is needed, such as digital servo motors, and electric power-steering systems. Its protection features include current-sensing and active-braking, which protect the motor from over-current and stalling. Overall, the A3966SLBTR is a highly accurate and reliable motor driver for powering brushless DC motors.

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