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DRV8873S-Q1EVM: Differences between MD006A and MD006B

suguru.fujikawa

Prodigy 10 points

Part Number: DRV8873S-Q1EVM

Tool/software:

Hi TI engineer,

The DRV8873S-Q1EVM is used to drive the motor, and the current is measured by an external ammeter.
When we prepared 2 configurations of controller →DRV8873S-Q1EVM and measured the current of the same motor, there was a difference in the current waveform, and when we investigated, one of DRV8873S-Q1EVM was MD006A and the other was MD006B.

From the above, I would like to ask the following two questions.
・MD006A and MD006B Changes
・Is there a possibility that the motor current waveform changes between MD006A and MD006B?

(Supplementary Explanation)
The PWM signal of the controller is connected to the pin near the center of the DRV8873S-Q1EVM and driven by PWM control.
The power supply is set to 7V/3A.

0 Keerthivasan Kumanan 20 days ago

TI__Genius 12925 points

Hi Fujikawa-san,

Give me 24 hours to look into this and get back to you.

Best,

Keerthi

0 suguru.fujikawa 14 days ago in reply to Keerthivasan Kumanan

Prodigy 10 points

Hi Keerthi,

I hope this message finds you well. I wanted to follow up on the question I asked recently. Have you had a chance to look into it?

Thank you for your help!

0 Keerthivasan Kumanan 13 days ago in reply to suguru.fujikawa

TI__Genius 12925 points

Hi Fujikawa-san,

I am still looking into this as I am currently unable to locate the board files for version A. I will give an update tomorrow.

Do you have some waveforms of PVDD, OUTx, INx and current?

Best,

Keerthi

0 suguru.fujikawa 11 days ago in reply to Keerthivasan Kumanan

Prodigy 10 points

Dear Keerthi,

Sends motor angular velocity and current waveform.
Unfortunately, there are no PVDD, OUTx, or INx waveforms.

There are differences in motor angular velocity and current waveform between MD006A and MD006B.

Please confirm.

0 Keerthivasan Kumanan 10 days ago in reply to suguru.fujikawa

TI__Genius 12925 points

Hi Fujikawa-san,

How many units have you tested?

Is this repeatable?

Is this variation not acceptable?

I have put in a request to pull in MD006A from our internal database

I will update you as soon as I have access.

Best,

Keerthi

0 suguru.fujikawa 10 days ago in reply to Keerthivasan Kumanan

Prodigy 10 points

Dear Keerthi,

We have tested more than 10 units and will surely reproduce them.
Another MD006B can also be used.

From MD006A to MD006B transition point
If you can find the reason for the current waveform change, there is no problem.

0 Keerthivasan Kumanan 7 days ago in reply to suguru.fujikawa

TI__Genius 12925 points

Hi Fujikawa-san,

I will update you tomorrow.

Best,

Keerthi

0 suguru.fujikawa 10 hours ago in reply to Keerthivasan Kumanan

Prodigy 10 points

Hi Keerthi,

Could you please let me know when we can expect the latest update? I appreciate your help and look forward to hearing from you.