Hi All,
I hope I am in the right section for this post. I intend to use the DRV8402 in a stepper drive application where the stepper current will be around 3.5A per phase. I was curious about the inclusion of inductors in the datasheet discussion and the EVM. Why are they needed and more specifically would they be needed when driving a stepper that would have 2.65 mH per phase.
I intend to configure the DRV8402 in full bridge mode. Would I be able to place a current sense resistor in the GVDD _B and GVDD_C lines to control the current in the stepper motor.
Apologies if these sound like really dumb questions. Please let me know what further details would clarify the question.
Cheers!
Peter
Hi, Peter,
Yeah, you got the right forum.
The output inductors are used to limit the current into our IC in case the outputs are shorted. Without them, our output current limiting won't work, and you will let the magic smoke out of our IC (eg, it will be fatally damaged).
You can sense current -- I need to find the reference schematic for that. I will post it later today.
-d2
Hi Don,
thanks for the reply. Yes the magic smoke, sadly I know it well.
Do you think there is any specific reason for the fact that there is no mention of stepper motors in the datasheet or promo material. Most times, steppers are mentioned in the possible apps with H bridges. Just curious.
cheers
No, we just left that out. It will work just peachy for steppers. The designers get mad at me when I tell them they're just designing high-current buffers! LOL.
not often that marketing miss a chance to claim something!
High current buffer is not very glamorous but while the DRV8402 is a very elegant design, it'd be hard to describe it better in 3 words.
Were you able to find the schematic suggestion for current sensing in a stepper type app?
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