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TPS54140 Switching Frequency always 500kHz

Stephan Schuler
Prodigy 40 points
Other Parts Discussed in Thread: TPS54140

Hello,

I use the Switcher PRO Software to calculate the TPS54140. My inputs are VIN = 12V, VOUT = 3.3V and IOUT = 1A.

If i look at the analysis window the switching frequency always is at 500kHz. But when I look into the datasheet I think I could use 2MHz to get smaller inductors and capacitors. I also tried to change the frequency manually, but found no way to do this. Is there maybe a bug in the software? Or how can I change the frequency?

I'm using SwitcherPro Desktop V3.11.5.2

Many Thanks,

Stephan Schuler

  • 0
    TI__Intellectual 2710 points

    Hi Stephan,

    This is not a bug in SwitcherPro. It is designed to use the default switching frequency when user creates a design using simple inputs or partnumber. To specify switching frequency (for the parts which support variable frequency), please use 'Advanced Inputs' tab of 'Create New Design' screeen. Please see below.

     

    Thanks,

    Hetal Joshi

    Senior Developer and Project Manager

    Analog eLab Design Center

    HPA Design Tools

    Texas Instruments, Inc.