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TPS54120 Output noise

Hithesh
Genius 3290 points

How does connecting an LDO at the output of the switcher lower the noise?

You still have switching noise. How does the LDO eliminate this.

Just the switcher itself has a noise of about 3mVp-p. What application would need lower noise?

See the video at the bottom of the page for the noise values- http://www.ti.com/product/tps62140

  • 0
    TI__Expert 8890 points

    Hi Hithesh,

    We are trying to reduce noise in general, while at the same time to reduce the fundamental switching signal, and the harmonics of the switching signal down to a good deal less than 0.1uV/root-hz  across the 100Hz-10MHz.

    Regards

    Bill

  • 0 in reply to Bill Stokes
    Genius 3290 points

    Bill Stokes said:

    Hi Hithesh,

    We are trying to reduce noise in general, while at the same time to reduce the fundamental switching signal, and the harmonics of the switching signal down to a good deal less than 0.1uV/root-hz  across the 100Hz-10MHz.

    Regards

    Bill

    Bill, how exactly is the noise reduced?