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TPS82130: rise time when the SS pin is left floating

Michael T Schneider
Expert 3790 points
Part Number: TPS82130

Team,

I am using TPS82130 to generate a regulated voltage that goes into capacitor banks. Can you provide the ramp rate of the output voltage when the soft-start pin is left floating ?

Is there any internal circuit that ensures no excessive inrush current occurs during the turn on of the power supply?

Here is a snippet of the datasheet. I cannot seem to deduce what the rise time is when the SS pin is left floating.

Please let me know.

  • 0
    TI__Mastermind 49430 points

    Hi Michael,

    We don't have ramp rate test data with the soft-start pin floating for TPS82130. The internal circuit could not ensure no excessive inrush current during start up for each applications. The inrush current depends on output capacitance and soft-start time. You need to add a soft-start capacitor to limit the inrush current in the circuit. The output capacitance may pull excessive inrush current that, in addition to the load, cause the inductor current to go high and hit current limit threshold, potentially causing longer start up time, or not starting up at all, or damage the power module.

    Thanks,

    Nancy