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TI Home » TI E2E Community » Support Forums » Power Management » Power Interface » Power Interface Forum » POE Protection - TPS23851 - SEN4 pin fuse
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POE Protection - TPS23851 - SEN4 pin fuse

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Frank Weiner
Posted by Frank Weiner
on Dec 17 2011 10:38 AM
Prodigy20 points

Hello,

In the data sheet for TPS23851 (bottom of p12) , SEN4 pin is specifically refered to as needing a fuse to 'meet clearance safety regulations'.  Can you explain the issue?  What about SEN1-3 lines - same issue?  Thank you.

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  • Bob Kando
    Posted by Bob Kando
    on Dec 19 2011 09:45 AM
    Verified Answer
    Verified by Bob Kando
    Genius9395 points

    Some equipment standards require certain creapage and clearance distance be maintained from high voltage to GND. The SEN4 pin which can be -48V is adjacent to the AGND pin of the TPS23851. If you have no such creapage and clearance specification to meet for your system, there is no need to do anything but direct wiring of SEN4 signal to the TPS23851 SEN4 pin. If you have such a requirement to meet, a fuse or a 20 ohm resistor in series with the SEN4 line will give the equipment protection from arcing. See your compliancee engineer and system specifications for appropriate actions for your equipment.

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  • Frank Weiner
    Posted by Frank Weiner
    on Dec 19 2011 09:53 AM
    Prodigy20 points

    Thank you for your explanation.  Makes sense now.

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