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TPS23751: Differences between the PoE powered device TPS2373xx / TPS2375xx

Martin Sauer
Prodigy 150 points
Part Number: TPS23751
Other Parts Discussed in Thread: TPS23731, TPS23734, , TPS23752, TPS23754, TPS23756

Tool/software:

Hi,

for a new project I'm looking for a PoE powered device with about 15W. On the homepage I can find a lot of devices. What is the difference between the individual types? I know there a flyback or active clamp forward types and PoE level.

Thank you for your help.

BR

martin

  • 0
    TI__Mastermind 37101 points

    Hi Martin,

    For 13 - 25.5W application PD chips,  TPS2373xx are newer than TPS2375xx. In general applications, TPS2373xx is recommend. See the difference below:

    TPS23731/4 (PD + PWM controller), newest:
    -            Compliance to IEEE 802.3bt, at
    -              0.3-Ohm typ. hotswap
    -              TPS23731 supports flyback; TPS23734 supports flyback/ACF (both have internal error amplifier, can be configured to low side SW Buck converter)
    -              Support primary side regulation (no need for OPTO feedback)
    -              Support auto maintain power signature
    -              Programmable frequency dithering for EMI
    -              Support soft-stop
    -              Support adapter priority
    -              VSON45 (7mm x 5mm)

     TPS23751/2 (PD + PWM controller):
    -            Compliance to IEEE 802.3at
    -              0.5-Ohm typ. hotswap
    -              Flyback with secondary side regulation only (no internal error amplifier)
    -              Sleep mode (disable DC/DC, TPS23752 only) and high efficiency light load mode (automatically reduce switching frequency at light load)
    -              Support adapter priority
    -              TPS23751: TSSOP16 (5mm x 4.4mm), TPS23752: TSSOP20 (6.5mm x 4.4mm)

     TPS23754/6 (PD + PWM controller):
    -            Compliance to IEEE 802.3at
    -              0.5-Ohm typ. hotswap
    -              TPS23754 has 15-V Vc UVLO; TPS23756 has 9-V Vc UVLO(used for low-voltage DC adapter case).
    -              Both support flyback/ACF-active clamping forward (no internal error amplifier for both)
    -              Support adapter priority & low voltage PD input
    -              HTSSOP20 (6.5mm x 4.4mm)

    Best regards,

    Diang