SLVSEI2A November 2018 – May 2019 TPS56339
PRODUCTION DATA.
The TPS56339 has an internal 5-ms soft-start. When the EN pin becomes high, the internal soft-start function begins ramping up the reference voltage to the PWM comparator.
The TPS56339 has been designed to prevent the low-side MOSFET from discharging a pre-biased output. During monotonic pre-biased startup, both high-side and low-side MOSFET are not allowed to be turned on until the internal soft-start voltage is higher than FB pin voltage. This scheme ensures that the converters ramp up smoothly into regulation point.