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TPS53319: question about schematic from WEBENCH

TS Yang
Genius 4800 points
Part Number: TPS53319

Hi,

I am interested in TI Design tool as follows.
What is the use of Ribst / Clfb / Clrfb in the yellow shade?
I wonder if it may be removed.

And below shematic is what we draw refer to the Webench tool, please check whether there's any wrong point or not.

thanks,

TS.

  • 0
    TI__Guru**** 191445 points

    TS,

    Those components are for ripple injection.  TPS53319 uses DCAP control topology.  It uses adaptive on time with hysteretic off time.  The hysteretic off time requires a ripple component of 15 mV typical on teh FB pin that is in phase with the switching waveform.  You can get this with higher ESR in the output capacitors (in which case you can remove the ripple injection components.  If you are using low ESR ceramic capacitors, as in the Webench  design, the ripple injection components will be required.