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TPS23751: Inquiry Regarding MPS Functionality in PoE PD Devices

Cosmos Wang
Prodigy 10 points

Part Number: TPS23751
Other Parts Discussed in Thread: TPS23752, , TPS23734, TPS23731, TPS23785B, PMP22806

Tool/software:

Dear Sir or Madam,

Do the TPS23751 and TPS23752 support IEEE 802.3at compliance and backward compatibility with IEEE 802.3af? Additionally, do both devices include Maintain Power Signature (MPS) detection functionality? If not, could you recommend any similar ICs that meet these requirements?

Thank you for your assistance.

Best regards,

Cosmos

  • 0
    TI__Mastermind 37281 points

    Hi Cosmos,

    TPS23751 and TPS23752 is AF and AT compliant. TPS23752 has auto MPS but only in sleep mode (when DC/DC is off but PD is on). 

    TPS23731 / TPS23734 have more flexible MPS configuration:

    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)

    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)

    Best regards,

    Diang

  • 0 in reply to Diang Xing
    Prodigy 10 points

    你好，Diang，

    我主要尋找支援自動 MPS 的 30W IEEE 802.3at/af 相容 PD + PWM 控制器晶片。 TPS23785B 是否符合這些要求？

    此致，

    宇宙

  • 0 in reply to Cosmos Wang
    TI__Mastermind 37281 points

    Hi Cosmos,

    TPS23785B不支持自动MPS。TPS23731和TPS23734符合您的需求。如果flyback，可以用TPS23731. PMP22806和TPS23731EVM可以供参考

    Best regards,

    Diang