SLUSCC7C July 2016 – June 2018 TPS546C23
The TON_RISE command sets the soft-start time. The charging current for the output capacitors must be considered when selecting the soft-start time. In some applications (for example, those with large amounts of output capacitance) this current can lead to false tripping of the overcurrent-protection circuitry if the soft-start time is not properly selected. To avoid false tripping, the output capacitor-charging current should be included when selecting a soft-start time and overcurrent threshold. Use Equation 28 to calculate the capacitor-charging current (ICAP).
In this example, the soft-start time is selected to be the default value of 5 ms. In this case, the charging current, ICAP, is 0.23 A.