TAS2557EVM: Need TAS2557 Power Down Sequence Review

Wayne Chen (ex FAE)

Part Number: TAS2557EVM
Other Parts Discussed in Thread: TAS2557

Hi Sirs,

Would you please review my customer's power down sequence of the TAS2557? It looks different to the specification of datasheet.

TAS2557 Specification

Thank you and Best regards,

Wayne Chen
10/15/2020

over 3 years ago

0 Luis Fernando Rodriguez S. over 3 years ago

TI__Guru* 84915 points

Hi, Wayne,

Our team will take a look at this and will reply as soon as possible.

Best regards,
Luis Fernando Rodríguez S.

0 Ivan Salazar over 3 years ago

TI__Guru* 95085 points

Hi Wayne,

As described in the data sheet, the supplies should at least power down at the same time, violating the power sequence could cause faults at internal level shifters and/or diodes being forward biased.

Please try to at least make the supplies to power down at the same time.

Best regards,
-Ivan Salazar
Applications Engineer - Low Power Audio & Actuators

0 Wayne Chen (ex FAE) over 3 years ago in reply to Ivan Salazar

Guru 15950 points

Hello Ivan,

Is customer's revised power down sequence valid for the TAS2557?

Thank you and Best regards,

Wayne Chen
10/22/2020

0 Ivan Salazar over 3 years ago in reply to Wayne Chen (ex FAE)

TI__Guru* 95085 points

Hi Wayne,

This looks better now, I just have one question:

Does 3.3V and 5V never go down to 0V? Or they do but it takes more time?

Best regards,
-Ivan Salazar
Applications Engineer - Low Power Audio & Actuators

0 Wayne Chen (ex FAE) over 3 years ago in reply to Ivan Salazar

Guru 15950 points

Yes, they can go down to 0V but take more time...Wayne Chen

0 Ivan Salazar over 3 years ago in reply to Wayne Chen (ex FAE)

TI__Guru* 95085 points

Hi Wayne,

Thanks for confirmation.

As mentioned it looks better know that all supplies are falling at the same time.

Please let us know if you have any further questions.

Best regards,
-Ivan Salazar
Applications Engineer - Low Power Audio & Actuators

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TAS2557EVM: Need TAS2557 Power Down Sequence Review