7.3.2 Soft Start and Pre-Biased Soft Start

The TPS563231 has an internal 1.5-ms soft-start. When the EN pin becomes high, the internal soft-start function begins ramping up the reference voltage from 0 V to 0.6 V linearly.

If the output capacitor is pre-biased at startup, the devices initiate switching and start ramping up only after the internal reference voltage becomes greater than the feedback voltage V_FB. This scheme ensures that the converters ramp up smoothly into regulation point.