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TPS23881: TPS23881: What is the maximum output power range of the PSE

? ?
Prodigy 30 points
Part Number: TPS23881

Tool/software:

TPS23881 can expand the maximum power sourced from 90 W to upwards of 125 W, 

What is the output power range of the PSE and pd terminals for POE power supply, and does the output power of the pse terminal be greater than 90W to meet the 802.3bt standard?

Is 99.9W  the maximum pse output power?

  • 0
    TI__Mastermind 37121 points

    Hi Yao,

    Thanks for reaching out!

    Yes TPS23881 is 802.3 BT standard compliant. In standard auto mode, the TPS23881 won't output more than 99.9W. In manual mode, 125W is reachable. 

    Best regards,

    Diang

  • 0 in reply to Diang Xing
    Prodigy 30 points

    I am making a POE power supply product, can the output voltage be set to between 52-57V, and the PD product will be continuously powered by 99.9W? How does the 99.9W power come from? Is there a corresponding voltage? 52V continuous output 99.9W, does it meet the 802.3BT standard?

  • 0 in reply to ? ?
    TI__Mastermind 37121 points

    Hi Yao,

    Type-4 PSE continuous power is limited to 90W according to 802.3BT standard.  At transient, 99.9W could be possible as Figure 145–24 and it won't trigger TPS23881's Pcut protection since the time is less than the tOVLD. 

    Best regards,

    Diang

  • 0 in reply to Diang Xing
    Prodigy 30 points

    Can I consider LOWERBOUND TEMPLATE as a recommended value?

    In fact, it is not mandatory to comply with, the current can work continuously between ILIM-2P min and PType max/Vpse, if it exceeds PType max/Vpse, it must be turned off, can this operation logic  also meet the 802.3BT standard?

  • 0 in reply to ? ?
    TI__Mastermind 37121 points

    Hi Yao,

    Thanks for your reply. I have a busy time now and will get back to you in 5 business days.

    Best regards,

    Diang 

  • 0 in reply to Diang Xing
    TI__Mastermind 37121 points

    Hi Yao,

    Thanks for your patience. 

    LOWERBOUND TEMPLATE is the PoE standard that the compliant products are required to meet.

    ILIM-2P min is also under a transient time. In most of cases, the 90-W continues power limit is more important.  

    Best regards,

    Diang

  • 0 in reply to Diang Xing
    Prodigy 30 points

    What is the Icon-2p , chass 8, 0.948A?

    56*0.948*2=106W.

    output voltage is 56V, then can i think 99.9W can work continuously, it also is a  compliant products that meets the PoE standard?

  • 0 in reply to ? ?
    TI__Mastermind 37121 points

    Hi Yao,

    In a 802.3BT compliant PSE auto mode, the power cut threshold is 90W for Class-8 PD. If the PSE continuous output power is higher 90W it may turn off the port. A transient power could be 99.9W but not continuous.

    Best regards,

    Diang