[crystal_lattice]

Hi Guys,

After paging through the millions of pages of this post and also skipping a few, it seems that the Allegro chip might actually be fixed and do the job. Is there anybody out there which can point me to the location of a working schematic and board layout which overcomes the microstepping issues which the 3986 had.

I was looking at the Gecko drive's again and although they look like good value for money, they are still expensive relative to my salary (or worse, the bit that is left over) so if the Allegro chip can do the same job for 1/10th the price I'm definitely interested

Best Regards

[H500]

Is there anybody out there which can point me to the location of a working schematic and board layout which overcomes the microstepping issues which the 3986 had.

The fix is in the A4989 chip. It's pin compatible with the a3986. You should be able to substitute it into one of the better a3986 boards.

[geofflw]

Allegro | Sales

[Alex7373]

Prompt please correctly I has established scheme elements?
Imax motor 6,0 A
Vmotor 50V
ROSC 10 Kom
IRF540N
CBOOT 47nF
RGH 40 oM
RSENSE 0.05 oM
CREG 2.2 mF
And for what it is necessary to connect GND и AGND ???

[robert557]

Hi guys
You have a functional version of the A3986 PCB 5A performance?
There are several versions but I do not know which works

[herdmay1]

don't use big mosfets, use IRFZ24n or smaller so that input capacitance is the least, the rest is not all that critical.. i have working PCB