Hi,
I use DRV8837. VM is supplied from USB (5 V). I run small cheap 6V DC motor purchased on eBay. There is 10 uF bulk capacitor for VM supply voltage (max. allowed by USB).
When reversing or braking there are quite big spikes on VM (up to 8 V). I guess that is due to back-EMF. This causes some issues for other devices on my PCB that are powered by the same USB line and of course it is violating USB rules.
Can you please advise something to eliminate the spikes?
Thanks
Martin