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TPS23861: There are some problems with THE TPS23861 SIFOS compatibility test！

user6251361
Prodigy 30 points
Part Number: TPS23861


Hi Team,

           I did a SIFOS compatibility test with TPS23861 and found two problems.

          1、  High_Sig_MaxV=11.9V，It ranges from 3.8 to 11 volts。

          2、 Min_Valid_Time_Tmps=110mS，It ranges from 1 to 60 mS。

          How to solve these two problems？ 

  • 0
    TI__Mastermind 41800 points

    Hi User,

    TPS23861 should pass SIFOS (please see below PDF).

    A couple of questions, do you have an updated version of SIFOS and conformance report like similar to the conformance report below?

    Also, do you have a schematic of the TPS23861 implementation? Are you running on autonomous mode?

    Thanks!

  • 0 in reply to Darwin Fernandez
    Prodigy 30 points

    HI,

    1、Can you help me analyze the schematic？

    2、TPS23861 works in automatic mode.

    PSE_TPS23861.pdf

  • 0 in reply to user6251361
    TI__Mastermind 41800 points

    Hi User,

    Looking at the schematic, can you make sure the 3.3V rail is powering up, after the 54V rail ramps up? There is a power up sequence on the TPS23861 that can cause it to misbehave if powered up incorrectly. If the 3.3V goes up before the VPWR goes above it's UVLO, you may need to replace the IC and check again with the correct power up sequence.

    The other things I see in the schematic is to try without Q6 since it add gate charge to the GATE pin of the IC.

    Also short R54 with 0 ohms resistor.

    Also R158 should 47 ohms