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TPS2373: Some questions about TPS2373 PD class...

Part Number: TPS2373
Other Parts Discussed in Thread: TPS2372

Dear Sirs,

I have some questions about the PD class and looking for the answer.


1. My design that using TPS2373-4 now and set PD class as class8, Is it ok to change to class6?

2. After changed to class6, how many watts (max) I will get from PSE? 

3. If the PD class is adjustable for TPS2373-4, what is the difference with TPS2373-3?

4. Did TPS2373-4 support auto class function or not? 

  • Hello,

    Thank you for your questions. Please find my answers below:

    1. Yes, it is ok if you change the class resistor to Class 6. This means the PD will only request and receive up to 51W in the Class 6 design (instead of 71W in the Class 8 design) .
    2. If the TPS2373 is connected to IEEE 802.3bt PSE, for Class 6 PD, the PSE will send 60W and the PD receive up to 51W at the PD input after 100m of CAT5e cable.
    3. The TPS2373-3 is rated for up to Class 6 (51W) applications whereas the TPS2373-4 is rated for up to Class 8 (71W) applications.
    4. The TPS2373 does not support autoclass but this is supported in our TPS2372 device.

    Please let me know if you have any additional questions. Thanks!

    Best Regards,

    Brett Colteaux

    PoE Product Marketing Engineer