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When the wiring resistance up to the capacitor at the soft start pin cannot be ignored, should it be calculated using the time constant? What equation is used to do this?
If the source current of the soft start pin is constant, then when the source current is isrc, the capacitance of the soft start pin capacitor is Css, the resistive component up to Css is Rss, and the soft start pin voltage is Vss, then Vss is given as follows.
Vss=isrc/Css*time Rss * isrc
When Vss is applied as a feedback voltage reference, the output voltage rises such that the feedback voltage becomes Vss. When the wiring is so long that the wiring resistance has an effect, there are concerns that malfunctions due to noise may occur, and further study is needed.