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TPS25940-Q1: Fault pull low during startup

JJ He
Prodigy 220 points
Part Number: TPS25940-Q1
Other Parts Discussed in Thread: TPS25940

Hi TI team.

During stratup, we have observed that the falut pin is pulled low and then pulled high. For reference, please find the the schematic of TPS25940 below:


And the startup waveform of VCC(IN), EN, FLT are as follow:

More detailed information regarding this drop is shown below:

Could you please review this behavior and confirm if it aligns with the expected specifications mentioned in the datasheet?

Thank you for your attention to this matter.

  • +1
    TI__Guru 56300 points

    Hi JJ,

    That is expected. So when VIN is below UV threshold the FET driving FLT pin will not get sufficient gate drive and it will be OFF. So FLT is pulled to supply. Now when VIN crosses UV threshold the FET gate will get sufficient voltage and it will cause FLT to go low. Now when device comes out of UV event then FLT goes high again.

    Regards

    Kunal Goel