DRV5023-Q1 Variability of td

masahiko shimizu

Other Parts Discussed in Thread: DRV5023-Q1

Hi,

My customer is using DRV5023-Q1
He wants to know variability of td in case of using one DRV5023-Q1.
Could you let me know the variability of td, please?

Best regards,
Shimizu

over 7 years ago

0 Rick Duncan over 7 years ago

TI__Guru** 114905 points

Hi Shimizu-san,

Our experts have been notified and should reply soon.

0 RE over 7 years ago

TI__Mastermind 20985 points

Shimizu-san, I have measured this using infinite persistence and found the jitter width to be 18µs.

Best regards,
RE

0 masahiko shimizu over 7 years ago in reply to RE

Guru 11235 points

Hi RE,

Thank you for support at last.

I have a question about this jitter.
Why does this jittter occur?
Could you let me know the cause of jitter, please?

Best regards,
Shimizu

0 RE over 7 years ago in reply to masahiko shimizu

TI__Mastermind 20985 points

Shimizu-san, this jitter is mostly a result of the sensor's periodic sampling being asynchronous to the real changing magnetic field.

Best regards,
RE

0 masahiko shimizu over 7 years ago in reply to RE

Guru 11235 points

Hi RE,

Thank you for your support.

I add question.

What does "sensor's periodic sampling" mean?

Is it "chopper stabilization frequency"?

Best regards,

Shimizu

0 masahiko shimizu over 7 years ago in reply to masahiko shimizu

Guru 11235 points

Hi RE,

How is the progress?

Best regards,

Shimizu

0 RE over 7 years ago in reply to masahiko shimizu

TI__Mastermind 20985 points

Shimizu-san, sorry for the delay as I'm traveling internationally.

Yes, the chopper stabilization frequency is the same as the sample rate I mentioned.

Best regards,
RE

0 masahiko shimizu over 7 years ago in reply to RE

Guru 11235 points

Hi RE,

Thank you for your support.

I understand it.

Customer has a question.

He thinks this jitter information is very important.

Why does not TI show about this jitter information in datasheet?

Is it too difficult to define about this?

Best regards,

Shimizu

0 RE over 7 years ago in reply to masahiko shimizu

TI__Mastermind 20985 points

I guess the original datasheet author didn't see this as something necessary to define. And in my experience, microseconds of jitter typically have an insignificant effect on motor performance, unless it's high speed and has many poles; however, many high speed BLDC systems go sensorless anyway.

I acknowledge that the exact jitter can certainly be important for some cases, and there is always value in stating more information.

Best regards,
RE

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DRV5023-Q1 Variability of td