Hi,
I'm using the DRV2700EVM Evaluation board and control it with the Piezo Control Console 1.2.9. When I adjust the lowest frequency (10Hz) the signal on the output (GND; out+) is deformed (with or without load on the output). With higher frequencies, the waveform looks more like a rectangular signal.
Attached the waveform:
Can anybody explain this behaviour?
Thanks
Hey Roman,
welcome to E2E Forum and thank you for posting your question!
If you check the DRV2700EVM User's Guide, page 25 on the schematic you will find these 2 capacitors, that are connected directly to the IN+ and IN- pins:
Now those are DC blocking capacitors, so they will block your DC input signal or act as a filter for your low frequency signal.
The easiest way for you would just be to short those 2 while running at such a low frequency, or better yet, to replace them with higher value capacitors (1uF should be enough).
Best regards,
Marko
