PoE doesn't work

[thiagohd]

I have powered with a 24V PoE adapter which I have from a router, but it didn't work.
Checking the temperature of the SI3404 controller, its temperature is around 70 Celsius degrees.

The voltage reaches C32, but VDD is always 0 V (VSS referenced).
I have checked D4 and C35, but they seem fine.

Did anyone have this problem too?

[kimble4]

It's designed for proper 802.3af PoE, and from the datasheet, the SI3404 regulator requires 37-57V to operate. I'm successfully powering a couple of these using 'passive' injectors (ie. those which simply supply power at all times, rather than negotiating with the device before supplying power as per the 802.3af spec) with a 48V supply. Kim.

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On 08/09/2022 21:24, Thiago Henrique Deicke wrote: I have powered with a 24V PoE adapter which I have from a router, but it didn't work. Checking the temperature of the SI3404 controller, its temperature is around 70 Celsius degrees. The voltage reaches C32, but VDD is always 0 V (VSS referenced). I have checked D4 and C35, but they seem fine. Did anyone have this problem too? — Reply to this email directly, view it on GitHub <#17>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AHLK6TW2Q6RBEAS6HUVSUFTV5JDOTANCNFSM6AAAAAAQIC63TQ>. You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[thiagohd]

@kimble4 You are absolutely right. The regulator requires 37-57V to operate.

Thank you. Let's close this.