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Original question:

TPS2372: Any filters are required to add between PD and DCDC?

TPS2372: PoE input filter for NoN-Isolated design

d_zero
Genius 4440 points
Part Number: TPS2372
Other Parts Discussed in Thread: TIDA-01463

Dear *,

we selected TPS2372 for PD and on the PoE voltage we have two DCDC connected.

1) Should we only have one input filter like in TIDA-01463 ?

2) How is the input filter calculated in non-isolated designs ? because we have different buck and LED driver.

Best Regards,

David.

  • 0
    TI__Mastermind 21320 points

    Hello David,

    It is up to you if you want the input filter. It is not a requirement of PoE, but i would advise putting some sort of filtering.

    For calculations, they are all essentially the same -- use the standard equations for capacitors and inductors. The only differences are calculating the voltage and currents on a node, since they will be affect by the topology. If the node is switching, then duty cycle and switching frequency have to be accounted for. 

    If this post answers your question, please indicate so by marking this thread as resolved. Thank you.

     

    Regards, 

     

    Michael P.

    Applications Engineer

    Texas Instruments