Ethernet shuts down at~50-55C

Chourizo
 
Posts: 8
Joined: Tue Jan 26, 2021 6:39 pm

Ethernet shuts down at~50-55C

Fri Jan 14, 2022 1:41 pm

Doing some tests with the vocorev2 running in a sealed enclosure. I noticed that ethernet stops working somewhere between 50 and 55C whilst the rest of the board is still working (I can connect via wifi up to 65C). I tested this with several boards, not just one.

I am measuring the temperature at the PCB directly. Ambient temperature is significantly lower.

Is there anything that can be done to prevent this from happening? (apply a heatsink to a specific point, turn off something in the firmware....)

Chourizo
 
Posts: 8
Joined: Tue Jan 26, 2021 6:39 pm

Re: Ethernet shuts down at~50-55C

Mon Jan 17, 2022 2:37 pm

Actually, after digging more into this this problem is related with the DC-DC converter that I am using to power the vocore. I beliebe this is EMC related. I guess the ethernet part is more susceptible towards EMC.
If I power it directly, it does work within the specifications.

Vonger
 
Posts: 862
Joined: Sun Oct 19, 2014 6:00 am

Re: Ethernet shuts down at~50-55C

Sat Jan 22, 2022 12:18 pm

VoCore2 need a pretty stable power input because its wifi, ethernet both are high speed port, maybe you can use a RC circuit or LDO or better DCDC at power supply part to reduce some noise.

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