DRV8803 power sequence

Atsushi Noda1

Intellectual 390 points

Other Parts Discussed in Thread: DRV8803, DRV8804

Are there any concern about power sequence for DRV8803?

VM fall time of our system is slow.
Therefore,I concern about the condition of the restart around UVLO.

Best regards,

Noda

over 9 years ago

0 Rick Duncan over 9 years ago

TI__Guru** 114905 points

Hi Noda-san,

We will investigate and reply soon.

How slow is VM fall time? Is there a specific VM waveform that you are concerned about?

0 Atsushi Noda1 over 9 years ago in reply to Rick Duncan

Intellectual 390 points

Rick-san,

I'm sorry, there are no specific waveform.

For a customer to prepare, a power supply changes with an application.

Start-up of DRV8804 had a case as unstableness in one customer.

Therefore I questioned whether there wasn't a care point about a power supply.

0 Rick Duncan over 9 years ago in reply to Atsushi Noda1

TI__Guru** 114905 points

Hi Noda-san,

Do you have any details on previous unstable start-up case?

0 Atsushi Noda1 over 9 years ago in reply to Rick Duncan

Intellectual 390 points

Hi Rick-san

DRV8803 doesn't accept INxx signal when repeating power on-off.
But, the frequency of occurrence is very low.
(About once a day...)

0 Rick Duncan over 9 years ago in reply to Atsushi Noda1

TI__Guru** 114905 points

Hi Noda-san,

Can you clarify?
Is it all INxx signals that are not accepted or just some? If some, which ones?
How long between power off and next power on?
Has the VM voltage, the INxx input and the output been capture during this event?

Thank you.

0 Atsushi Noda1 over 9 years ago in reply to Rick Duncan

Intellectual 390 points

Rick-san

I'm sorry that reply is late.
We verified again but didn't happen.
It's checked us a little more.

Thank you.

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DRV8803 power sequence