We want to regulate winding current with DRV8802-Q1.
We refered SLVA416 application report and tried to do it with DRV8802EVM.
As an evaluation, the VREF input for DRV8802EVM is a sine wave from FG.
Other pin configuratin is following.
Enable A : Hi
Phase A : Hi
AI0 : Lo
AI1 : Lo
nRESET : Hi
nSLEEP : Hi
Decay : Lo
The output load is 20ohm and 0.44mH, a speaker.
(Rather than the speaker, we are going to use a VCM in actual system.)
As a result, we got the following output.
You can see the ripple on the output current.
Do you have any idea for eliminating it or reduce?