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DP83848I-POE-EK: DP83848N Overshoot

Yang Wu

Intellectual 2840 points

Part Number: DP83848I-POE-EK

Hi Team,

My customer is using DP83848N (Not in Ti.com, while I am trying to reach out you through DP83848I-POE-EK) with PoE. when they plug the network cable, overshoots occur in IC's pins (TD-/TD+/RD-/RD+) as the figure shown below (10.6V volts).

I want to make sure that it is risky or not? Because this overshoot exceed the limit in the datasheet . In addition, do you have some suggestions to lower down the overshoot?

The sch are also shown below.

Thanks a lot.

Best regards,

Yang

over 4 years ago

0 Aniruddha Khadye over 4 years ago

TI__Mastermind 18425 points

Hi Yang,

The DP83848 POE EK schematic is posted on this E2E thread: https://e2e.ti.com/support/interface/f/138/p/689022/2548055#2548055?jktype=e2e

Can you ask customer to check if the schematic recommendations are followed. The PHY MDI pins should not have 10.6V present at any time.

-Regards

Aniruddha

0 Yang Wu over 4 years ago in reply to Aniruddha Khadye

TI__Intellectual 2840 points

Hi Aniruddha,

Thanks for your reply. I am pushing this E2E to customer.

Best regards,

Yang