SLVSF07 July 2021 TPS7H5001-SP
The soft-start circuit increases the output voltage of the converter gradually until the steady-state programmed output is reached. During soft-start, the error amplifier uses the voltage on the soft-start pin as its reference until the SS pin voltage rises above VREF. Once the voltage at SS pin is above VREF, the soft-start period is complete. Note that the voltage at SS pin will continue to rise and once it reaches 1 V, the synchronous rectifier outputs of the controller will become active.
A capacitor between the SS pin and AVSS controls the soft-start time of the PWM controller. The following equation can be used to select the capacitor for the desired soft-start time: