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TPS23730: Can TPS23730 support .at input spec(37V~57V)?

Ben Kuo
Expert 7560 points
Part Number: TPS23730
Other Parts Discussed in Thread: TPS23881, TPS23731, TPS23734

Dear team,

I would like to double confirm with you about input UVLO spec of TPS23730.

According to IEEE802.3af spec, VDD input range is from 37V to 57V at PD side when negotiation successful.

In TPS23730 datasheet - *PD input supply UVLO_rising*, the voltage range is from 35.8~39.5V which may lower than .af input spec.

Could you double confirm if TPS23730 can support IEEE802.3af PSE or not? Thanks.

BR,

Ben

  • 0
    TI__Mastermind 21320 points

    Hello Ben,

    Yes the TPS23730 should be able to support an IEEE802.3.af PSE. 

    I have checked it with a Type 2, Type 3, Type 4 and TPS23881 PSE EVM and it correctly negotiated power will all of them. I also ran it through a SIFOS PD300 analyzer (checking IEEE802.3.at) and it passed all tests. 

    The .bt is a subset of .at, which is a subset of .af. Which means .bt is compatible with .af devices (both ways). So if it is able to negotiate power with .bt and .at PSE's (both TI and non-TI) then it should be clear for .af.

    I would note the TPS23730 is a Type 3 device, whereas the TPS23731 or TPS23734 are Type 2 devices if you wanted to get something closer to the actual power range of the application.

    If this post answers your question, please indicate so by marking this thread as resolved. Thank you.

     

    Regards, 

     

    Michael P.

    Applications Engineer

    Texas Instruments