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10BASE-T1L, PoDL, Single Pair Ethernet

suresh11

Hello

I am implementing Power over Data Line in my 10BASE-T1L project. I checked the Würth Electronics webinar video on YouTube "Single Pair Ethernet filter design for industry". The following picture is taken from that [presentation](https://www.we-online.com/web/en/index.php/show/media/06_passive_components_-_custom_magnetics/events_1/webinar_videos/2021_webinars/Single_Pair_Ethernet_Filter_Design.pdfhttps://www.we-online.com/web/en/index.php/show/media/06_passive_components_-_custom_magnetics/events_1/webinar_videos/2021_webinars/Single_Pair_Ethernet_Filter_Design.pdf).

Here, a differential mode inductor is used to inject/takeout DC power on the line. What should be the minimum value of coupled inductor (U3 & U4) for class power (IEEE802.3cg class 10-12)? This might be quite a simple question, but I am very new to circuit design. 

image

Regards

Raj

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  • 0 in reply to shabaz

    Hi Shabaz,

    Thank you for the response. I am using 47uH inductor. The data signal is not impacted. However, I have a different problem. 

    The following two figures depict my test set-up and PoDL schematic. I am using Analog Device EVAL-ADIN1110EBZ board which has 10BASE-T1L (ADIN1110 chip).

    imageimage

    differential mode inductor(L1): WE-744871470

    Transformer: WE-74930120

    Problem:

    The ethernet link is always down (LINK_DOWN) when the device is powered by PoDL. It only works if at the beginning device is powered up from another power source (PoDL is disconnected, at least GND), bring the LINK UP, then switched it to PoDL. It will continue to work until there is no change in the link status i.e. no reset.

    Regards

    Suresh