DRV8837: Power-on/off Sequence

Sadanori Kato

Part Number: DRV8837

Hi,

As mentioned in DRV8837 data sheet, there is no power sequence required for this device.
However, DRV8837 doesn't work normally on customer's board when applying VM and VCC supply voltage at the same time.
On the other hand, DRV8837 works normally when applying VM after VCC is applied.
So, what are the possible causes for this symptom ?

Best regards,
Kato

over 5 years ago

0 Rick Duncan over 5 years ago

TI__Guru** 114905 points

Hi Kato-san,

Can you provide additional information?
What are VM and VCC voltages?
Do you have scope captures of working and non-working sequence (VM/VCC and OUT1/OUT2)?
What are IN1 and IN2 when the device is working, non-working?
What is the load on the outputs?

0 Sadanori Kato over 5 years ago in reply to Rick Duncan

Guru 36490 points

Hi Rick-san,

Thank you for your quick response.

I will look into them and will get back to you.

Best regards,
Kato

0 Sadanori Kato over 5 years ago in reply to Sadanori Kato

Guru 36490 points

Hi Rick-san,

Our customer is continuously investigating this issue, so I will contact you if I have additional questions from him.

Best regards,
Kato

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DRV8837: Power-on/off Sequence