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PoE device case grounding

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tinska.h

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Hello all,

I'm designing a power over ethernet (PD, not source) device and I'm struggling with proper case grounding scheme. For simplicity I've chosen TI's TPS2375 as PoE manager and non-isolated step-down DC-DC switcher.

In my mind PoE supply ground might be in different potential than mains ground line or ESD-protection ground line. How should case ground be connected safely? I need case grounding for EMI protection to instrumentation inside the device.


Thanks,
 

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