Take care when handling this product and other components connected to it. Step and microstep size Stepper motors typically have a step size specification e. Please note that measuring the current draw at the power supply will generally not provide an accurate measure of the coil current. The driver requires a logic supply voltage 3 — 5. There are no news items available for this product. Feedback Comments or questions? For existing customer transition, and for new customers or new applications, refer to the A
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Click the image to view larger. Unipolar motors with five leads cannot be used with this driver. Click the image to view larger. Products New Products Specials! Special power-on sequencing is not required.
A3955: Full-Bridge PWM Microstepping Motor Driver
Step and microstep size Stepper motors typically have a step size specification e. During stepping operation, the chopping control in the A automatically selects the current decay mode, Slow micrsotepping Mixed.
This device is no longer in production. Alternatives available with variations in these parameter s: 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. Another way to set the current limit is to calculate the reference voltage that corresponds to your desired current limit and then adjust the current limit potentiometer until you measure that voltage xllegro the VREF pin.
Microstepping provides increased step resolution, and reduces torque variations and resonance problems at low speed.
A4988: DMOS Microstepping Driver with Translator and Overcurrent Protection
This carrier board uses low-ESR ceramic capacitors, which makes it susceptible to destructive LC voltage spikesespecially when using power leads longer than a few inches. N header pins soldered? Click the image to view larger. Minimal wiring diagram for connecting allegrp microcontroller to an A stepper motor driver carrier full-step mode. Mixed decay current control results in reduced audible motor noise, increased step accuracy, and reduced power dissipation.
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 in detail. The A includes a fixed off-time current regulator that has the ability to operate in Slow, Fast, or Mixed decay modes.
One way to maximize stepper motor performance is to use as high of a voltage as is practical for your application. 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 in detail.
Allegro MicroSystems – A Full-Bridge PWM Microstepping Motor Driver
Simple step and direction control interface Five different step resolutions: Nonlinear increments minimize the number of control lines necessary for microstepping. 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. Allegor Email a friend Feeds. Power connections The driver requires a logic supply voltage 3 — 5. Internal circuit protection includes thermal shutdown with hysteresis, transient-suppression diodes, and crossover-current protection.
This product ships individually packaged with 0. Using the driver Minimal wiring diagram for connecting a microcontroller to an A stepper motor microsteppping carrier full-step mode.
Internal circuit protection includes: If this is not your local microsteppinv, find your local sales rep here. Stepper motors typically have a step size specification e. 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.
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 VREF pin voltage is accessible on a via that is circled on the bottom silkscreen of the circuit board. 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.