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Supercap on TPS54260 Output - Best Efficiency

Chris Read
Genius 3345 points
Other Parts Discussed in Thread: TPS54260

I'm trying to build as energy efficient a system as possible--for 12 to ~30V source voltage operation.  I'd like to be able to use a supercap to provide a voltage for a time after power is lost...

Is it reasonable to use a supercap (say, for example, .25F) directly on the output rail of the TPS54260?

Do I need to use the SS/TR pin to limit current at startup?

Are there any other concerns with using the supercap as the output capacitor of the TPS54260?

Thanks!

  • 0
    TI__Guru**** 191445 points

    We have not really done any work at all with supercaps and teh TPS54260.  We may have done one or two designs using other controllers, but I do not have immediate access to the details.  that being said, I do not see any reason that would prevent it.  i assume the ESR whould be relatively large, so you can probably get a reasonable loop bandwidth.  There will certainly be issues with current at start up.  The TPS54260 will limit the current internally, but that may be as high as 7-8 A.  To slow the slow start voltage ramp using a slow start cap, may require another large capacitor.  i would consider using some type of controlled ramp generation instead.