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TPS2378EVM-602: enabling on-board switch-mode regulator

Errol Leon6
Expert 5830 points
Part Number: TPS2378EVM-602
Other Parts Discussed in Thread: TPS2378, TPS23861EVM-612, TPS23730EVM-093

Hello team,

My customer did a quick test with the TPS2378EVM-602, by connecting the evaluation board to their system with PSE functions. They worked together very well, and their PSE chip was providing power to the evaluation board, with no problems. But they have just one little issue that they need guidance on.

They couldn’t make the on-board switch-mode regulator working and could not measure any voltage output between VOUT/TP1 and PGND/TP4, which was supposed to be 19V.

Does the customer need to do or change anything or setup to make it work? The customer would like to see the rest of the evaluation board working so the power from the TPS2378 can have some load.

Thank you in advance for your support!

Errol

  • 0
    TI__Mastermind 21320 points

    Hello Errol,

    1. Can you comment on the load level and type, in light of  section 6.4 Startup to Resistive Overload with TPS23861EVM-612?

    2. This PD is dual sourced for UPOE. Can you confirm the PSE supports UPOE?
    - Also please know, UPOE and IEEE802.3 standard are not the same standard. IEEE802.3.bt defines PoE power up to 71W. We have other designs that can support up to 51W, like the TPS23730EVM-093. 

    Please refer to this training video for non-compliant high power solutions: https://training.ti.com/tps23723-working-noncompliant-high-power-pses-upoe-poe-and-poh 

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

     

    Regards, 

     

    Michael P.

    Applications Engineer

    Texas Instruments 

  • 0 in reply to Michael Pahl
    TI__Mastermind 21320 points

     Hello,

    I have not heard from you in a few days. Do you have any update on this post? I want to make sure you are setup for success for your project, but if I do not hear from you I will close this thread. Feel free to post here or on a new E2E post to continue the conversation. Thank you 

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

     

    Regards, 

     

    Michael P.

    Applications Engineer

    Texas Instruments 

  • 0 in reply to Michael Pahl
    TI__Expert 5830 points

    Thank you for the information Michael.

    1. Currently they have no load at the 19V/2A output connector on the EV board.
    2. They had measured the power of 54VDC (VDD/PWRGND, or TP17/TP7) after the PD device on the EV board.

     

    But they were not able to make the following DC/DC regulator working. Do they need to provide load to the 19V/2A output? If they do need to do so, how big the load should it be?

    Thanks!

    Errol

  • 0 in reply to Errol Leon6
    TI__Mastermind 40385 points

    Hi Errol,

    Since this was posted on the weekend, please give time for our apps engineer to respond early this week. Thanks!

    One thing is that the EVM MUST have both pairsets powered for the DCDC to work. This is shown from the logic circuit on RTN of each PD. If you connect this to a non-UPOE switch, then only pairset might turn ON but the logic will keep the DCDC off. Thanks!