A3967SLBTR-T

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The A3967SLBTR-T is part of the motor drivers, controllers, and power management integrated circuit (PMIC) portfolio of Allegro MicroSystems, Inc. This PMIC is designed to control and manage the operation of low-voltage, three-phase brushless DC (BLDC) motors, and brushless AC (BLAC) motors utilizing sensorless algorithms in a wide range of applications. It features a 3.3V or 5V logic supply and a current sense amplifier that provides a current range from 1A to 25A, making it suitable for a diverse range of motors.

A3967SLBTR-T Application Field

The A3967SLBTR-T is suitable for a wide range of applications, including brushless DC motor control, brushless AC motor control, and power management applications like motor pre-driver solutions and motor control solutions. It is typically used in fan and blower applications, actuators and valves, medical pumps, automotive and industrial applications, video and other media processing, and home appliance applications.

Some of the key features of the A3967SLBTR-T that make it suitable for these applications are its high-current range, low-voltage input, sensorless algorithms, and high accuracy current sense amplifier. These features enable the device to provide precision motor control while minimizing power consumption.

A3967SLBTR-T Working Principle

The A3967SLBTR-T is based on a typical three-phase brushless DC motor control scheme. It utilizes a three-phase bridge consisting of six FETs with sense amplifiers for current monitoring. Additionally, it contains an Analog Front End (AFE) for assisting with position sensing. The AFE continuously generates a low-frequency sine wave to detect the rotor position. This data is then used by the microcontroller to calculate the commutation sequences.

The device provides the appropriate logic control signals to control the FETs according to the predetermined logic decisions. It also provides the appropriate sensorless control signals to adjust the motor speed. The motor speed can be set through a variety of control inputs, including a clock signal, step and direction, PWM, and analog inputs.

Additionally, the device contains a range of protection features such as overtemperature protection, short circuit current limit, and undervoltage lockout. These features ensure the safe and reliable operation of the A3967SLBTR-T.

Conclusion

The A3967SLBTR-T is a versatile PMIC designed to manage and control low-voltage, three-phase brushless DC and AC motors. It provides a current range of 1A to 25A and utilizes sensorless algorithms for motor control. It is suitable for fan and blower applications, actuators and valves, medical pumps, automotive and industrial applications, video and other media processing, and home appliance applications. With its high-current range, low-voltage input, and a range of protection features, the A3967SLBTR-T is an ideal solution for precision motor control.

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