TPS2379: TPS2379DDA

Sai Ravali

Part Number: TPS2379
Other Parts Discussed in Thread: UCC2897A

Tool/software:

IP Speaker 6Sep2024.rar

We have implemented PoE along with DC mains to operate our board. Requesting to review the PoE section in the layout and please share us your feedback.

over 1 year ago

0 Diang Xing over 1 year ago

TI__Mastermind 37111 points

Hi Sai,

Thanks for reaching out!

I will take a look on the PoE PD part and get back to you early next week.

Best regards,

Diang

0 Sai Ravali over 1 year ago in reply to Diang Xing

Prodigy 70 points

Hi Diang Xing,

Thanks for your response. I will be looking forward for your suggestions.

Thank You.

0 Brandon Beader over 1 year ago in reply to Sai Ravali

TI__Genius 15745 points

Hi Sai,

Diang is out of office and will be back early next week, please expect a response from him then. Thanks for your patience!

Regards,

Brandon

0 Sai Ravali over 1 year ago in reply to Brandon Beader

Prodigy 70 points

Hi Brandon & Diang,

Thanks for your reply, Noted. Waiting for your review.

Best Regards,

Sai Ravali

0 Diang Xing over 1 year ago in reply to Sai Ravali

TI__Mastermind 37111 points

Hi Sai,

Thanks for your patience!

Best regards,

Diang

0 Sai Ravali over 1 year ago in reply to Diang Xing

Prodigy 70 points

Hi Diang Xing,

Gentle Remainder !!

Please review the layout and share us your feedback as early as possible. Our design is on hold and we are waiting for your feedback. Hope you understand.

Best Regards,

Sai Ravali

0 Diang Xing over 1 year ago in reply to Sai Ravali

TI__Mastermind 37111 points

Hi Sai,

Thanks for your patience!

May I know what is your PoE power? I had reviewed the TPS2379 related circuit and please find the comments below. Besides, let me know if you have not got the UCC2897A circuit reviewed I can help you to transfer.

1. The capacitance between VDD-VSS needs to be 50 – 120 nF, and now you have 200nF. Besides, the 100-V Y-cap in the cycles will make the isolation level less than 2kV as C706. It is recommended to not add cap or use 2kV pF level capacitors in the cycled area.

2. The 2kV isolation distance for Earth and ethernet terminal is recommended to be 1.524mm or longer.

3. It is recommended to not have vias beneath the chips center. Especially avoiding the Earth is beneath the chip and has a distance less than 1.524mm.

4. If your current is higher than 1A, 0805 or larger size 0-Ohm resistors are recommended for lower conductance loss and thicker layout wire.

Best regards,

Diang

0 Sai Ravali over 1 year ago in reply to Diang Xing

Prodigy 70 points

Hi Diang,

Thanks for your suggestions,

we have designed PoE for 60W.

Need to review UCC2897A also.

0 Diang Xing over 1 year ago in reply to Sai Ravali

TI__Mastermind 37111 points

Hi Sai,

I will forward your question to UCC2897A Team.

Best regards,

Diang

0 Hong Huang over 1 year ago in reply to Diang Xing

TI__Guru 74115 points

Hi,

Please provide the document which you want us to make review.

0 Sai Ravali over 1 year ago in reply to Hong Huang

Prodigy 70 points

Hi Hong Huang, Please check the attached altium file and review the PoE switch controller section and share your feedback.

IP_SPEAKER (9-25-2024 1-29-53 PM).zip

Thanks & Regards,

Sai Ravali

0 Hong Huang over 1 year ago in reply to Sai Ravali

TI__Guru 74115 points

Hi,

I will review the file on the UCC2897A portion. This will take a few days usually within a week. I will reply by then.

0 Sai Ravali over 1 year ago in reply to Hong Huang

Prodigy 70 points

Hi Hong Huang,

Thanks for your reply. We are waiting for your feedback.

Best Regards,

Sai Ravali

0 Hong Huang over 1 year ago in reply to Sai Ravali

TI__Guru 74115 points

Hi,

It looks a big concern is GND and PGND connection. The datasheet suggests connect GND and PGND on the two pins underneath the package. Yours is through several layers copper polygons. I suggest you follow the datasheet since the copper polygon planes cannot avoid the current cross flow between GND and PGND which can make noise and affect GND connected weak signals. Suggest only connect GND and PGND at the two pins underneath the IC. The copper polygon for GND only connected to those return paths to GND and the copper polygon for PGND only connected to those return paths to PGND to avoid currents cross flowing to minimizing the associated noise, or more than one loop for a connection which can make ground shifting then another possible noise that very difficult to resolve.

Please make this change and send the changed layout to me for another review.

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TPS2379: TPS2379DDA