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TPS40210 error message: Unable to calculate compensation for this LC combination corner frequency is too high

Paul Kendle
Intellectual 1975 points
Other Parts Discussed in Thread: TPS40210

I am using the advanced input option for a TPS40210 design.  Vin = 10V-20V, Vout = 30V, Iout = 500mA, Fsw = 250 kHz.

I get this error message:

Unable to calculate compensation for this LC combination corner frequency is too high!, make the inductor or output capacitor value Larger!
Design Halted.

Is there a place I can edit the L and C values?

Thanks

  • 0
    TI__Intellectual 1280 points

    Paul,

    This problem is related to another issue that we've already fixed in SwitcherPro.  The next version will be on the web this Friday before noon.  I tried this design and it does do a design instead of halting however.  Another bug is causing the selected output capacitor to be too small for this design.  I'll work on that.  

    So on Friday when you do this design in version 3.1 of the tool try changing your output capacitor to be EEVFK1V101P qty 2..  You nee more than 200uF of output capacitor to give the compensation routine a chance at making it stable.

    Thanks

    heath