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TPS23785B: TPS23785BPWP as a POE powered device has no output

Part Number: TPS23785B

Hi All,

One of my projects uses TPS23785BPWP as a POE powered device with 12V output. After we received the designed board and connected to the POE switch, the power supply did not work, and the POE switch have not respond. We verified that other POE distributors, the POE switche can work normally.

I added the schematic diagram for my design, can u help to analyze the cause of the problem?


Best Regards

  • Hello,

    The CTL pin is pulled to VSS. Why was this done?

    Can you confirm the DCDC works by applying 48V on VDD_VSS?

    Special note

    Active – Limited TI design support

    This product has limited direct TI design support for existing projects. If available, you can find relevant collateral and software on the product folder. For existing designs using this product, you may request support in the TI E2E support forums, but limited support is available for this product.

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




    Michael P.

    Applications Engineer

    Texas Instruments