ASLPTR-T. MOTOR DRIVER, STEPPER, 2 O/P, TSSOP ALLEGRO MICROSYSTEMS. Minimum Order: 1. £ Cut Tape. This board is based on Allegro Microsystems A Stepper Motor Driver IC. The A is a complete microstepping motor driver, with built-in translator. A Microstepping DMOS Driver with Translator FEATURES AND BENEFITS Allegro MicroSystems, LLC Northeast Cutoff Worcester, Massachusetts.

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A – Allegro Microsystems

I think I’ve just figured out what’s going on. I think the standard approach is to disconnect the motor from the driver completely. This terminal should be decoupled allwgro a 0.

Potentiometer Questions Started by norbss Yesterday at Special power-up sequencing is not required. At power up, or reset, the translator sets the DACs and phase current polarity to initial home state see figures for home-state conditionsand sets the current regulator for both phases to mixed-decay mode. The minimum purchase order quantity for a377 product is 1.

Allegro A3977 the replacement of UCN5804. Datasheet!!

Anyway, I found out that this stepper drive only powers one of the windings to the stepper when there is no STEP. Also, I was looking at the other schematic you posted earlier.


Disabled A3977 When the SR input is logic high, synchronous rectification is disabled. Going from a higher-resolution mode to a lower-resolution mode should only be done when both modes appear on the same row of table 2 from the datasheet Eighth Step 5 and Full Step 1, etc.

Remember, the noise isn’t a bug There are no news items available for this product.

Decoupling capacitor – load supply. Is there an application note on the use of external diodes? The A interface is an ideal fit allevro applications where a complex microprocessor is unavailable or over-burdened.

Looks like it has more torque than mine. When using external diodes, synchronous rectification should be disabled to achieve maximum results. If the allegeo at the PFD input is greater than 0.

By continuing to use this site, you are consenting to our use of cookies. Q9 – What type of external components are required?

I’v mentioned disconnecting the steppers from the system for this action, but they don’t seem to listen! This active-low input enables all of the DMOS outputs. The VREG pin should be decoupled aplegro a 0.

Q1 – Is there an application note for the A? Then follow table below to get your desired current by adjusting the Cur pot. When I have the board powered up 24V and the A is not enabled, I find that moving the steppers around by hand is killng the Allegros. Matilda New Member Dec 16, Is the A a drop-in, or pin-for-pin replacement, for any other device?


In the event of a fault excessive junction temperature, or low voltage on VCP the outputs of the device are disabled until the fault condition is removed. The A includes a fixed off-time current regulator that has the ability to operate in slow- fast- or mixed-decay modes.

Matilda New Member Sep 25, Q6 – What type of protection features does the A offer? The A will automatically select the decay modes suitable for optimum performance. To participate you need to register. While the A trys to hammer the stepper hard at the 2Khz signal. If the voltage at the PFD input is greater than 0.