Since the input voltage to the driver can be significantly higher than the coil voltage, the measured current on the power supply can be quite a bit lower than the coil current the driver and coil basically act like a switching step-down power supply. In Mixed decay mode, the device is set initially to a fast decay for a proportion of the fixed off-time, then to a slow decay for the remainder of the off-time. The MP carrier can deliver up to 1. The headers can be soldered in for use with solderless breadboards or 0. There are no phase sequence tables, high frequency control lines, or complex interfaces to program. This device is no longer in production. Some unipolar stepper motors e.

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One way to set the current limit is to put the driver into full-step mode and measure the current running through a single motor coil while adjusting the current limit potentiometer.

For more information, please see the frequently asked questions. The newer A offers overcurrent protection and has an internal k pull-down on the MS1 microstep selection pin, but it is otherwise virtually identical to the A A Stepper Motor Microstepipng Carriers.

The A supports such active current limiting, and the trimmer potentiometer on the board can be used to set the current limit.

The chip has three different inputs for controlling its many power states: The current limit, I MAXrelates to the reference voltage as follows:. Mixed decay current control results in reduced audible motor noise, increased step accuracy, and reduced power dissipation. Internal synchronous rectification control circuitry is provided to improve power dissipation during PWM operation.


Allegro MicroSystems – A DMOS Microstepping Driver with Translator and Overcurrent Protection

Special power-on sequencing is not required. A to A Application Note. We’ll notify you when there are updates to this product. Stepper microstdpping typically have a step size specification e. If this is not your local representative, find your local sales rep here.

The headers can be soldered in for use with solderless breadboards or 0. A microstepping driver such as the A allows higher resolutions by allowing intermediate step locations, which are achieved by energizing the coils with intermediate current levels.

The A interface is allegroo ideal fit for applications where a complex microprocessor is unavailable or is overburdened. It allows the simple input of one pulse on the STEP pin to drive the motor one microstep, which can be either a full step, half, quarter, or sixteenth, depending on the setting of the MS1 and MS2 logic inputs.

N header pins soldered? Special power-on sequencing is not required.

A4988 Stepper Motor Driver Carrier

Free add-on shipping in USA. This board ships with 0. This device is no longer in production. The A includes a fixed off-time current regulator that has the ability to operate in Slow, Fast, or Mixed decay modes. The A includes a fixed off-time current regulator which has the ability to operate in slow or mixed decay modes. Click the image to view larger. Also, note that you will need to perform this adjustment again if you ever change the logic voltage, Vdd, since the reference voltage that sets the current limit is a function of Vdd.


During stepping operation, the chopping control in the A automatically selects the current decay mode, Slow or Mixed. For both package styles, the thermally enhanced pins are at ground potential and need no electrical isolation. Internal circuitry determines whether the PWM current-control circuitry operates in a slow recirculating current-decay mode, fast regenerative current-decay mode, or in a mixed current-decay mode in which the off-time is divided into a period of fast current decay and with the remainder of the fixed off-time spent in slow current decay.

Minimal wiring diagram for connecting a microcontroller to an A stepper motor driver carrier full-step mode. Shop Blog Forum Support. There are no news items available for this product.

Allegro MicroSystems – A Full-Bridge PWM Microstepping Motor Driver

Internal circuit protection includes thermal shutdown with hysteresis, transient-suppression diodes, and crossover-current protection. The MP carrier can deliver up to 1. Note that we carry several stepper motor drivers that can be used as alternatives for this module and drop-in replacements in many applications: Products New Products Specials!