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TPS23730: Classification when connected IEEE.802.3at or IEEE.802.3af PSE

Shinichi Inoue
Guru 20391 points
Part Number: TPS23730

Dear Specialists,

My customer is considering TPS23730 and has a question.

I would be grateful if you could advise.

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If the connected PSE only supports up to IEEE.802.3at or af, how would it be classified?

In our case, CLSA=32Ω and CLSB=130Ω for using CLASS6.

Since CLSA = 32Ω, is it set to CLASS4?

Could you please let me know which category will be.

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I appreciate your great help in advance.

Best regards,

Shinichi 

  • +1
    TI__Prodigy 270 points

    Hi Shinichi,

    Yes, it would be set to Class 4 for PSE that supports IEEE802.3at. Since the customer is not using a PSE that supports IEEE.802.3bt, then the number of class cycles would not be 4 or greater, which effectively nullifies the use of CLSB. Therefore since CLSA = 32Ω, the PD would be set to Class 4. 

    Best regards,

    Nahiyan Muzaffar

  • 0 in reply to Nahiyan Muzaffar
    Guru 20391 points

    Hi Nahiyan,

    Thank you for your reply.

    I understand.

    In this case, it will be Class 4.

    I'll share this with the customer.

    I appreciate your great help and cooperation.

    Best regards,

    Shinichi