A4985SETTR-T

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The A4985SETTR-T is a product of Allegro Microsystems and fall under the category of PMIC - Motor Drivers, Controllers. It is a device specifically designed to provide full-bridge brushless DC motor control, with both analog and digital inputs, using the Hall-effect sensor based rotor position information. The A4985SETTR-T has easily user definable parameters, such as overcurrent limiting, current regulation, start-up timer, etc. and also provides protection from shorts, lock-ups and thermal runoff. This device is equipped with built-in Linear Technology (LT3690) integrated FET drivers which enable high-power, high-speed switching of the two power transistor outputs.

The major applications for the A4985SETTR-T include industrial control, pool pumps, fans, and robotics applications. It is also suitable for any application requiring full-bridge control of high-precision brushed DC motors, with variable speed capability.

The working principle of the A4985SETTR-T is described as follows. It uses the Hall-effect sensor based rotor position information to control a speed-controlled DC brushless motor. This device takes the analog voltage voltage input, which is proportional to the desired motor speed and compares it with the signal provided by the Hall sensor. This feedback information is then taken by the PWM signal generator, which produces a pulse-width modulated (PWM) signal required to drive the power transistors of the full-bridge circuit. This signal is then fed to the power transistors and thus the motor speed is regulated.

The A4985SETTR-T provides functional safety and thus offers important industrial safety related features. It has an optional short-circuit protection, which can be enabled or disabled, and also incorporates a failsafe circuit. On top of that, this device also monitors the junction temperatures of the power transistors, with the help of selected sense elements. This ensures that the junction temperature doesn’t exceed a certain limit, thus preventing thermal runaway of the device.

Overall, the A4985SETTR-T is a powerful and efficient device for controlling brushless DC motors. It helps to maintain the speed of the motor that is desired and is suitable for various industrial applications. It’s high-speed switching capability, user definable parameters, protection features, and taken thermal-runaway prevention make this product a must-have for all applications involving brushless DC motor control.

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