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Decide soft-start cap of LT8643S

Category: Hardware
Product Number: LT8643S


I'm a DFAE in Japan. Our customer evaluates LT8643S's soft-start and gives us a question. We don't find the equation for the relationship between output rise time and TR/SS capacitance on the data sheet. Could you give us it?



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  • Hello Hiroyuki,

    I was referring to 1.6V as the reference voltage for soft-start voltage. If you refer from the Soft-Start Tracking figure and the TR/SS Pin function from the datasheet, the FB voltage shows that it should only regulate to internal reference voltage, 0.97V when the TR/SS Voltage reaches 1.6V.

    Upon simulating LT8643S,

    The FB pin already regulates to 0.97V when TR/SS pin reach 0.97V.