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Original question:

TPS23751: TPS23751 fail in MaxI_1/Ppeak_1 items.

[FAQ] PoE PD Controllers: Why am I failing Ppeak during inrush?

Chen Bogey8
Mastermind 9990 points
Part Number: TPS23751

Hi Sir,

I am exceeding Type 1 Ppeak (13W) during inrush current. Do you have any suggestion to avoid this issue?

Bogey

  • 0
    TI__Genius 9230 points

    Hi Chen,

    The load should be disconnected from the converter during the 81.5ms inrush period so that the input inrush current (limited to 140mA) can be used to fill the bulk capacitor. See sections 7.4.1.5 & 7.4.1.7 of the TPS23751 datasheet for more details.

    Additionally, be sure that you are not exceeding the operation current limit & staying within the 12.95W max power limit for class 3.

    Thanks,
    Tom Amlee
    PoE PD Apps Engineer