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PoE PD based on PMP1360

Leonid Gnusin
Prodigy 150 points
Other Parts Discussed in Thread: PMP, PMP8803

Hello,

In previous designs we just used PoE PD based on PMP1360 reference design, and we would like to use in new design also. So, these re several questions about it:

  1. Are there any updated in PMP 1360? The last version I found is Rev. C.

  2. Can you please advise about additional EMC guidelines – please sagest useful optional common mode chokes and ferrites to be added on PoE, 48V and 12V AUX inputs and fro 12V output (it used in our design as external power source).

  • 0
    TI__Mastermind 41790 points
    Hi Leonid,

    1) REVC is the latest revision of PMP1360.
    2)Please see below link that describes best practices for EMI compliance of an isolated power supply.
    www.ti.com/.../slua469.pdf

    As for the common mode chokes and ferrite bead selection. It really depends on the initial conducted emissions test done on the board. But here are some rules of thumbs:
    It's best to leave space on the PCB for both a choke and ferrite beads (after the diode bridge).
    CM chokes will help for earth referenced outputs as it introduces a common mode noise path to circulate. This will also help with lower frequency noise (around the switching frequency).
    Ferrite beads impedance graphs vary. Be sure it is most inductive around the frequency that needs to be more suppressed. Ferrite beads will typically help in mitigating the higher frequency noise (>1MHz).

    If interested in one of our newer reference designs, please see PMP8803 below. It's product page has test information and schematics as well.
    http://www.ti.com/tool/pmp8803

    Thanks!

    Regards,
    Darwin
  • 0 in reply to Darwin Fernandez
    Prodigy 150 points

    Tnx for useful information!

  • 0 in reply to Leonid Gnusin
    Prodigy 150 points
    Hello Darwin,
    Can you please check in Slua469 regarding to L2 common mode winding start direction?