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TPS54160

viswa balaji
Prodigy 20 points
Other Parts Discussed in Thread: TPS54160

Hi,

I had got a design from switcherpro around a month ago for the following spec

Vin 28VDCmax

Vout 5V

Iout 0.65A

The Inductor, diode and output capacitor values were given as follows

Diode B240A

Inductor 47uH

Output cap 22uF(qty 1)

Now if i redo I see a change in the Diode and capacitor

Capacitor has drastically changed to 100uF(qty2)

I've already finished the CAD activity with 22uF. Pls suggest more on this

  • 0
    TI__Intellectual 1280 points

    We changed the cap selection routine for TPS54160 as part of a bug fix in the last release, so that’s why it’s picking larger caps now.

     

    The fix was put in place to help the compensation routine.  If the software picked caps that were too small the compensation routine sometimes couldn’t converge on a solution with enough phase margin.

     

    In this case it looks like the software didn't complain about phase margin on the older design so the compensation routine was able to work with the smaller cap.  So your old design should be stable.  the newer design should also be stable.  If it's going to unstable the software will typically put up some warnings and errors about gain and phase margins.

    The new cap selection for this device allows the software to design over a wider range of design inputs.

     

  • 0 in reply to Heath Gallimore
    Prodigy 20 points

    Thanks for the reply!

     Could you please have a look at the schematic below and let me know if it can source around 800mA?

    This is as per the old suggestion given by switcherpro. I just wanted to an opinion on the same.

  • 0 in reply to viswa balaji
    TI__Intellectual 2710 points

    Hello,

    Please contact your local AFA for help verify your design.

    Thanks,

    Hetal Joshi

    Senior Developer and Project Manager

    Analog eLab Design Center

    HPA Design Tools

    Texas Instruments, Inc.

     

    TI makes no warranties and assumes no liability for applications assistance or customer product design. You are fully responsible for all design decisions and engineering with regard to your products, including decisions relating to application of TI products. By providing technical information, TI does not intend to offer or provide engineering services or advice concerning your designs.