DRV8825 Questions

Projects Programming
1

I have an average working knowledge of this stepper driver board and had been experimenting and playing with it over the past few years.

I use capacitors for the VMOT and Motor GND pins before and recently, a few thoughts hit my head.

All documentation that I’ve seen says to use a minimum of 100uF (or even 67uF) ‘close to the DRV Board’ but I haven’t seen any reference as to a voltage. Allow me to explain my confusion and concern.
I have several 100uF capacitors—-some marked with 25V, some marked with 16V, etc.; the same for the 67uF capacitors I have.
I am planning a project which uses only 10.5V (from a bench power supply) to operate NEMA17 stepper motors. Should I use a 16V 100uF capacitor for each DRV8825 I’m using since I won’t be exceeding 16V (or even close to it)?

Also….can I solder the capacitor directly to the DRV8825 board’s VMOT and Motor GND pins or do I need to devise an elaborate system that takes 10.5V from a bus (I will have approximately 15 DRV8825 boards in this project) and solder each HOT and GND wire with the capacitor close to the board before they hit the VMOT and Motor GND pins?

I appreciate any and all advice and explanations.

Thank you.

Jay

2

People commonly use a safety margin of two with electrolytic capacitor voltage ratings. But 16V with a 10.5V bench supply should be OK.

You can solder them directly to the module pins, but the motor power supply leads should also be soldered.

3

Okay. Thank you kindly for the reply.

I had planned on using regular jumper wires from the 10.5V bus to the DRV and solder the capacitor(s) underneath the pins.

Good plan?

4

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