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CICLON FET Error with TPS40k at 5V input

Ryan Henderson
Intellectual 980 points

I am getting an error message when I try to switch to any CICLON FET when I design a TPS40K device with a 5V input voltage.  Below is the error message:

This MosFET caused the basic design calculations to fail!
LowSide Mosfet Calculation Failed.
This device doesn't have a good rdson specifications.

Surely this isn't the case with such a low Rdson at 4.5v

 

Ryan

  • 0
    TI__Intellectual 2710 points

    When displaying the MosFETs in the selection window, that list is not sorted or filtered. The list contains all the available MosFETs in SwitcherPro database. So, when you select a MosFET from that list, it may be possible that the MosFET may not work for the socket you are selecting it for.

  • 0
    TI__Intellectual 1280 points

    In most cases the CiCLON FETs will work fine with the TP40K devices.  You might check into the gate voltage for the part you are using.  I think most of those devices have between 6 to 8Volts on the gate.  I'm not sure if all the CiClone mosfets work with 8V gate voltage.  Rdson at 8V might be an issue for our tool that does linear interpolation of the rdson (which we know isn't linear)  Let me know what Device and input specifications you were using and I'll see if I can reproduce the problem.