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output capacitor of TPS20xxC.

Knighty Nimp
Expert 1260 points

 

How to choose output capacitor of TPS20xxC, in the EVM selected 150uF(minimum 120uF) electrolytic cap which is high expensive, I read in datasheet, we can used 10uF cap so my question is 120uF O/P cap required by  USB standard or 120uF is for prevent output negative only?

 

Thanks,

 

 

 

 

 

 

 

 

 

 

  • 0
    TI__Genius 9415 points

    The 150uF capacitor on the output of USB switches is a USB spec requirement. It does control output ripple and is helpful to control transients, especially when the load transitions (make or break plug-in load).

    If there is no USB specification requirement and you always know the load that will be supported and it's maximum ripple requirements, It is possible to use smaller output capacitance.