Hi team,
Customer now meet issue with ISO11452-9 EMC test, do we get ISO11452-9 test for DRV8889-Q1?
Their design as attached, could you help get any suggestion to improve the low frequency noise?
Now configure:
Smart tune dynamic decay mode, as they tried all the mode, this get the lowest audio noise;
VREF set current 0.8A, DAC torque set 50%;
205 Goerdyna DRV8889-Q1 Sch.zip
Thanks and Best regards,
Will
Hi Will,
We do EMI tests for the EVM qualification. As well as several customers are using this product in their application that are shipping for a while now. Based on the critical frequencies listed it looks like chopping frequency related EMI. Customer can try increasing the four highlighted capacitors. Like 2.2 nF or 3.3 nF tops.
The frequency shown does not look like it is charge pump related energy. Using a ferrite bead at C174 and VM1 connection line will help mitigate this. I think trying the four capacitors would be the first step. Thanks.
Regards, Murugavel
