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TPS54225/6 Soft Start capacitor

Tsukui Yusuke
Guru 21930 points
Hi,
 
What the limite of  Soft start capacitance for TPS5422×?
My customer is going to use 0.0165μF.
Please tell me limitation and the matters that require attention of the capacity of the capacitor.
 
Best Regards,
Yusuke.

 

 

  • 0
    TI__Guru**** 191445 points

    In general, the SS cap is intended to allow slow start times from around 1-20 msec.  That is typically the range of interest for power supply applications.  If the SS cap is too small, there may be timing issues where the SS time finishes before the VIN is fully in regulation.  It can also cause the device to reach current limit during SS.  These all depend on Vin, Vout and the output capacitance and Vin rise time, so the minimum SS cap is different for different applications.  I don't think it is characterized.  You just need to use common sense I think.  Let me know if you want further details.