JAJSSC7 December 2023 TPSI3100
ADVANCE INFORMATION
As described in the Equation 3 section, the start-up time of the fully discharged VDDH and VDDM rails depends on the amount of capacitance present on the VDDH and VDDM pins, as well as, power being used from VDDM for any auxiliary circuitry. The rate at which this capacitance is charged depends on the amount of power transferred from the primary side to the secondary side. At start up, the power regulation loop transfers more power until the VDDH and VDDM rails reach their steady state values.