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TPS23750, PoE, Power Levels, Class 4 devices

Craig Young
Prodigy 55 points
Other Parts Discussed in Thread: TPS23841, TPS23750, TPS23754, TPS23756

My customer is designing with the TPS23750 and they would like to know if this device supports Class 4 PD devices.  The customer's PD device requires 24W and they are using 42V from the PSE (TPS23841).  The TPW23841 allows currents up to 510mA and they would like to use all of this power.  Judging from the data sheet, they can only get 410mA from TPS23750 which will produce only 17.2W.

Can you give me some guidance as to whether the TPS23750 is the correct part or if they should be looking at a difference device?

  • 0
    TI__Expert 7990 points

    I recommend the TPS23754, TTPS23754-1 , or TPS23756. 

    These devices are IEEE 802.3at standard compliant.  IEEE802.3at requires  PD support of 2-event hardware classification in conjunction with Class 4. 

    The parts actually will carry over 700mA with no compromise and support higher efficiency topologies that benefit from dual gate drive including active clamp forward and driven-gate flyback.

  • 0 in reply to Martin Patoka
    Prodigy 55 points

    Thank you for the reply, I have recommended these devices to the customer.

    Regarding the TPS23750 which they are currently using, can they actually get .44A from this device?  The data sheet indicates that this part will support up to .44A, but they are only getting  about .3A from it now (13W at 42V).  Can you verify that this device will in fact support .44A?

  • 0 in reply to Craig Young
    TI__Mastermind 42795 points

    The pass device (MOSFET) in the TPS23750 is rated at 405mA minimum current limit. So provided the device does not enter thermal shutdown, current limit be at least 405mA.