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ADP7118 Soft Start Time

Question asked by ricky on May 1, 2016
Latest reply on May 26, 2016 by ricky

Hi All,

 

I have a question about SStime calculation for the ADP7118 LDO.

In the data sheet page 15, SStime calculation equation is expressed as next,

SStime (usec) = 380us + 0.6*Css, (where Css is in F)

 

When Css is 10nF, SStime is calculated as 380us + 0.006us = 380.006 us

On the other hand, Figure 49 shows SStime curve, and SStime curve for Css=10nF is more than 6ms.

What is wrong on my understanding?

 

By the way, Capacitance of 0.1uF is acceptable for Css?

 

Best Regards,

  Ricky

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