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TPS7A470x soft start

Reiner Boettcher
Prodigy 110 points

Hi

We would like to use the TPS7A4701 with a soft start time shorter than 65ms.

Is is possible to use a 0.1uF Cnr capacitor?

What influence we get on PSSR and on  Noise and soft-start time?

regards Reiner boettcher

  • 0
    TI__Guru 55940 points

    Hi Reiner,

    It is possible to use a 0.1uF Cnr capacitor.  Figures 11 and 12 in the datasheet give an indication of how Cnr effects PSRR.

    Start-up will be faster as you do not need to charge as fast of a capacitor.  Due to the low noise architecture, the start-up equation is much more complex than a more traditional LDO architecture.  A great way to test out TPS7A4701 is to use TPS7A4701EVM-094.  With the EVM you can see how TPS7A4701 operates in your system and can easily experiment with the trade-offs of adjusting capacitors.

    Very Respectfully,

    Ryan