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Shop Blog Forum Support. Schematic diagram of the A stepper motor driver carrier both green and black editions. One way to maximize stepper motor performance is to use as high of a voltage as is practical for your application. The A is designed to drive one winding of a bipolar stepper motor in a microstepping mode. Take care when handling this product and other components connected to it.

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A4988 Stepper Motor Driver Carrier

Internal circuit protection includes thermal shutdown with hysteresis, transient-suppression diodes, and crossover-current protection. There are no news items available for this product. 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.

Power connections The driver requires a logic supply voltage 3 — 5. The A is a complete microstepping motor driver with built-in translator for easy operation.

The current limit, I MAXrelates to the reference voltage as follows:. One way to maximize stepper motor performance is to use as high of a voltage microsteoping is practical for your application.

Note that the STEP and DIR pins are not pulled to any particular alegro internally, so you should not leave either of these pins floating in your application.

A to A Application Note. Shop Blog Forum Support.

Pololu – A Stepper Motor Driver Carrier

Also, if the supply voltage is very high compared to what the motor needs to achieve the set current, the duty cycle will be very low, which also leads to significant differences between average and RMS currents. 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.


Motor connections Four, six, and eight-wire stepper motors can be driven by the A if they are properly connected; a FAQ answer explains the proper wirings allegrl detail.

Nonlinear increments minimize the number of control lines necessary for microstepping. Note that we carry several stepper motor drivers that can be used as alternatives for this module and drop-in replacements in many applications:. Unipolar motors with five leads cannot be used with this driver.

A version of this board with headers already installed is also available. The translator is the key to the easy implementation of allfgro A Internal pulse width modulated PWM current control microetepping with an internal three-bit nonlinear digitalto- analog converter allows the motor current to be controlled in full- half- quarter- or eighth-step microstepping modes.

The translator is the key to the easy implementation of the A This current-decay control scheme results in reduced audible motor noise, increased step accuracy, and reduced power dissipation.

For instance, driving a motor in quarter-step mode will give the step-per-revolution motor microsteps per revolution by using four different current levels. This device is no longer in production. Date of status change: N header pins soldered?

A3955: Full-Bridge PWM Microstepping Motor Driver

The A interface is an ideal fit for applications where a complex microprocessor is unavailable or is overburdened. We’ll notify you when there are updates to this product. We’ll notify you when there are allegdo to this product. If this is not your local representative, find your local sales rep here.


You can also solder your motor leads and other connections directly to the board. 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.

Otherwise, the intermediate current levels will not be correctly maintained, and the motor will skip microsteps. Add to cart Add to wish list.

The coil current can be very different microsepping the power supply current, so you should not use the current measured at the power supply to set the current limit.

Allegro MicroSystems – A Microstepping DMOS Driver with Translator

Print Email a friend Feeds. This product ships with all surface-mount microdtepping the A driver IC—installed as shown in the product picture. The combination of user-selectable current-sensing resistor and reference voltage, digitally selected output current ratio; and slow, fast, or mixed current-decay modes provides users with a broad, variable range of motor control.

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