A3973SB-T

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PMIC - Motor Drivers, Controllers have become commonplace today in a range of motor-controlled applications. The A3973SB-T is a motor driver controller integrated circuit (IC) that falls into this category, and the aim of this article is to explain its application field and the working principle, in hopes of helping those who may find themselves tasked with implementing it.

The A3973SB-T is a motor driver IC that is designed to be used in unipolar and bipolar stepper motor applications, as well as in brushless DC motor control applications. It is characterized by its operating voltage from 5V to 30V, half-bridge output currents up to 1.2A for each channel, and a wide range of over current protection settings, making it ideal for use in a variety of stepper motor, brushless DC motor, and other motor-control applications.

The A3973SB-T IC operates by utilizing two complementary high-side and low-side MOSFETs, or metal–oxide–semiconductor field-effect transistors, to drive the motor in either a forward or backward direction. At the heart of the IC is the power logic module, which is responsible for the control of the low-side and high-side MOSFETs, effectively controlling the direction of the motor.

In unipolar stepper motor mode, the power logic module abstracts signals from 4 input pins, allowing the motor to operate in either the forward or reverse direction. In bipolar stepper motor mode, the power logic module abstracts signals from the 4 input pins, allowing the motor to operate in either the forward or reverse direction. This IC uses a constant current drive scheme, where the d-axis current needs to be set using a separate external resistor in order to limit the current. This current is then compared to a reference current that is stored in the IC, with the phase of the motor pulsed off when the reference current is exceeded.

In brushless DC motor mode, this IC operates by utilizing the same principle of comparing the current with the reference stored within it, however the transition of the reference occurs at zero crossing of the voltage. The IC then outputs a peak current for the motor depending on the duty cycle that is set by the user.

The A3973SB-T IC also has a wide range of over current protection settings, including thermal-shutdown, over temperature warning, and a logic power-on reset, allowing you to customize the operation of the IC to suit your particular application. It also has two user programmable internal voltages, allowing you to set the voltage levels of the logic power supply and the d-axis current value. This allows for further customization of the IC for different kinds of motor applications.

In conclusion, the A3973SB-T IC is a versatile and feature-rich motor driver controller suitable for use in a range of motor-controlled applications. It can be used in unipolar and bipolar stepper motor mode, as well as a brushless DC motor mode. It is characterized by its operating voltage of 5V to 30V, a wide range of over current protection settings, and user programmable internal voltages which allows for further customization. We hope this article has helped demonstrate the range of features available on the A3973SB-T IC and the various applications it can be used for.

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