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TPS2640: tdvdt calculation on TPS2640

Part Number: TPS2640

Hi,

According to the datasheet P.10, Output ramp time is typical 8.35ms as follows:

  

However, we calculate the tdvdt (Output ramp time) on Equation2 on the datasheet P.18.

Result is tdvdt = 20.8 * 10^3 * 24V * 80% * 22nF = 8.785ms.

 

*1. Is it correct calculation?

*2. Could you please let us know the reason why the value is different?

 

Thanks and best regards,
M.HATTORI.