A3979SLP

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The A3979SLP is a complete microstepping motor driver with built-in translator, being part of the A3978 Motor Driver family from Allegro Microsystems. It is a two-phase brushless DC (BLDC) motor controller/driver with a wide operating range of up to 5A and can be used to drive a variety of motor sizes.

The A3979SLP is suitable for a wide range of applications, from basic to more complex ones such as air conditioners, pumps, fans, power tools and medical equipment. This device is intended for use with a two- phase bipolar stepper motor and offers a selection of 1/2, 1/4, 1/8 and 1/16 microstepping options. It embeds a full H-bridge with an on-chip PWM current control, and is optimized to have low RDS(ON) ratings (total of <600mΩ per H-bridge). Additional features include an internal charge pump and kick start logic that helps the driver to reduce the power consumption during operation.

The A3979SLP is mainly designed to minimize the number of external components required, as it has an integrated translator. On one side, the translator translates a step and direction digital or analog input into an internal micro-stepping sequence. On the other, the device also features a full H-bridge motor driver that provides the necessary current to power the motor. In addition, the device has a low on resistance value, making it suitable for a variety of process and environmental conditions. The A3979SLP additionally has logic compatible inputs and can be used with 3.3V and 5V devices.

The working principle of the A3979SLP is based on the idea of dual H-bridge control. The top H-bridge is used to control the current of the motor, while the bottom H-bridge is used to control the direction. The device features a Pulse Width Modulated (PWM) current control, which means that the motor current, and hence the velocity, is controlled via two Pulse Width Modulation (PWM) signals. The A3979SLP also features an integrated translator, which can be used to convert step and direction inputs into a sequence of microsteps. The PWM current control will then limit the amount of current going into the motor.

The A3979SLP has several features that make it suitable for a wide variety of motor drivers and controllers, including an on-chip PWM current control, a built-in translator, kick start logic, an overtemperature protection and optional half or full-duplex communications protocols. Its wide operating range of up to 5A makes it suitable for many applications, such as air conditioners, pumps, fans, power tools and medical equipment.

In conclusion, the A3979SLP is a versatile, two-phase brushless DC (BLDC) motor controller/driver designed to minimize the number of external components required. It has a wide operating range of up to 5A and a built-in translator, which can be used to convert step and direction inputs into a sequence of microsteps. The device also features an on-chip PWM current control, kick start logic, and overtemperature protection, making it suitable for a wide range of applications.

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