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TPS7A20C: How do you create such a fast slew rate (200nsec)?

KENJI YASUDA
Prodigy 30 points
Part Number: TPS7A20C

Tool/software:

The data sheets for these two LDOs use slew rates of 200nsec and 1μsec for the load transient. We have been experimenting with these two load transients, and although we were able to experiment with a slew rate of 1μsec, we were unable to create a slew rate of 200nsec with our electronic load equipment. . How do you create such a fast slew rate (200nsec)? Could you please show us about your measurement environment?

  • +1
    TI__Mastermind 37025 points

    Hi Kenji,

    First make sure that your electronic load can slew this fast (it should say in your manual).  If so, you need to minimize the wiring between your LDO output and your electronic load. Ideally your PCB is mounted directly onto the electronic load leads - with absolutely no cables or wiring whatsoever.  If you have wiring and cables between the electronic load and the PCB holding the LDO, the inductance in the wiring will likely not allow you to slew this fast.

    We have a custom load transient circuit which we have characterized and use to take all of our load step measurements.  We do not use electronic loads for this as they are too slow.

    Thanks,

    Stephen