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TPS63050: Soft start inquiry

Cedrick
Expert 8270 points
Part Number: TPS63050

Hi, 

Good day. I hope you are doing fine. 

Our customer is using the TPS63050RMWR and they have question about its soft-start.
1. Does the Vout ramp quicker if SS pin is left floating (no capacitor connected) OR if a 1nF capacitor is connected to SS pin as per the application circuit?
2. What is the effect of leaving SS pin floating to Vout?


Additionally, do we have a formula to estimate the capacitor value for certain soft-start time?

Thank you for your support. Have a great day. 


Regards,

Cedrick

  • 0
    TI__Expert 7925 points

    Hi Cedrick,

    Thanks for reaching out.

    The soft-start function is not well documented in the datasheet. I will have to check with the team and will get back to you by the end of the week. I am sorry for the delay. What I can tell you in the meantime:

    1. Vout ramps faster if the SS pin is left floating.
    2. Leaving SS pin floating makes the soft-start time shorter.


    Best regards,
    Milos

  • 0
    TI__Expert 7925 points

    Hi Cedrick,

    I just want to confirm what i already answered. 

    Unfortunately, we do not have a formula for estimating the soft start time, as it depends on many operating conditions. 

    Best regards,
    Milos