The Soft-start function is initiated when the input voltage (VIN) reaches the minimum operating voltage and UVLO voltage after power on, it is to prevent that the DC/DC converter will cause a large inrush current and overshoots of output voltage. The DC/DC converter is made to start up in a smooth manner by provision of a start up time (soft-start time). There are products with an internally fixed soft start time and products with externally adjustable soft-start time setting pin, and products externally adjustable with an oscillator maximum duty cycle (to be explained later).
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