Soft start for TPS61175 works differently than many converters. Normally the SS voltage will be a non invering input to the error amplifier and the output will track the lower of the reference voltage and the ss voltage. On the TPS61175, the SS is used to clamp the COMP pin voltage. So the peak cycle by cycle current is limited by the SS circuit. The datasheet suggest you use the table to choose the SS cap value.
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