Soft-Start After the POR function is completed with VCC reaching 4.375V, the soft-start sequence is initiated. Soft-Start, by its slow rise in CORE voltage from zero, avoids an over-current condition by slowly charging the discharged output capacitors. This voltage rise is initiated by an internal DAC that slowly raises the reference voltage to the error amplifier input. The voltage rise is controlled by the oscillator frequency and the DAC within the ISL6553, therefore, the output voltage is effectively regulated as it rises to the final programmed CORE voltage value.
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