DRV8703-Q1: nFAULT recovery

Soichiro Aoki

Part Number: DRV8703-Q1

1ch：VM
2ch：nFAULT
3ch：AVDD
4ch：DVDD

Dear support team,

If VM underboltage occurs, nFAULT is driven LOW.
After that, nFAULT may return to HIGH even though it is below the recovery voltage.
What could be the reason for this?

Best Regards,
Aoki

over 2 years ago

0 Shinya Morita over 2 years ago

TI__Mastermind 45075 points

Hi Aoki san

Thank you for your questions.

This is expected behavior. Please refer datasheet here.

regards

Shinya Morita

0 Soichiro Aoki over 2 years ago in reply to Shinya Morita

Prodigy 40 points

Hi Morita san

Thank you for answering.
However, the UVLO2 recovery voltage should be at least 5.4V.
When I look at the oscilloscope, nFAULT is HIGH even at 4.95V.
Can nFAULT go HIGH even when VM voltage is below UVLO2?

Best Regards,
Aoki

0 Shinya Morita over 2 years ago in reply to Soichiro Aoki

TI__Mastermind 45075 points

Hi Aoki san

Thank you for your question.

Yes, UVLO2 recovery voltage should be ~5.4V.

I see "4.95V" on the bottom of scope, I guess it may has small accuracy shift or measurement point voltage could be slightly different from VM(#28) pin and GND.

regards

Shinya Morita

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DRV8703-Q1: nFAULT recovery