According to datasheet, Css si connected between SS pin and GND to adjust soft start.
However, EVM has an additional resistor R3 (10Kohm) in series.
What is the R3 for?
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the R3 in this case is used to have better adjustments for the softstart time. Capacitor values have a quite big step from one value to the other whereas Resistors have much smaller steps available. So if you would like a time which is in-between two Capacitor values this could be adjusted this way.
please have a look at this picture in the datasheet: (chapter 7.3.1 Soft Start)
As you can see the softstart cap will be charge by an internal resistor. So adding another external resistor does influence the charging curve of the softstart cap. Also that generic calculation is described there