Hello
Please tell me about a noise measures method for DRV8801.
For details, look at an attached file.
Best Regards,
Kei
This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
Hello
Please tell me about a noise measures method for DRV8801.
For details, look at an attached file.
Best Regards,
Kei
Sato-san,
I have assigned this post to an applications engineer. Due to the holidays please expect a delay in response. Thank you for your patience
Hi Kei,
Could you let us know why we need to control that slewing noise? for EMI reason?
You are right when add caps > 0.22, OCP will be tripped due to the charging current.
One possible way is to add L and C together to filter the noise. Normally we need 47uH or more.
Best regards,
Hello Wilson,
Thank you for your reply.
Yes, EMI reason.
When you use an inductor of 47uH, can you use a capaciter of how much capacity?
Best Regards,
Kei
Kei, I think you'll have to measure it in your system to know the answer. 47uH could allow a 2x larger capacitor, or more. Just try some different values.
Best regards,
RE
Hello RE,
Thank you for your reply.
I put an inductor(47uH) and a capacitor between OUT+ and OUT-, but there was not a noise decrease.
A noise can decrease by putting a common mode filter in OUT+ and OUT-.
Is there not a problem even if I put a common mode filter in OUT+ and OUT-?
If there is the reference example that put a common mode filter in OUT+ and OUT-, please tell me.
Best Regards,
Kei