Hello,
I am using drv8711 motor driver in my design. I also have DRV8711EVM.
The only differences between my design and DRV8711EVM is mosfets and limit resistor.
My mosfets are CSD17506Q5A and my limit resistor value is 0.01 Ohm.
The problem is, when i connect my stepper motor to EVM and set values there is no noise everything is ok. But when i connect my stepper motor to my driver card, both while motor is just powered or jogging or running, there is an annoying sound like an "open tap" and like there is lots of ripples in power line.
Then i decided to make same noise in EVM, changed every value randomly but could not get that noise. Even i configure awfull values to EVM it works quiter than my motor driver card (in both low and high current applications).
When i look through scope while motor is stepping and while motor stops i got these outputs. (videos)
Stepper motor= st6018L3008-A (parallel connection)
Pulse= external indexer mode (10KHz-30Khz)
Working Current= 4 Amp RMS
For running situation:
http://youtu.be/HABwYoj9sHI
For stopped situation:
Can you help me?