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LT1963 / LT3015

Hello,

I would like to know if there is a maximum limit to the bypass capacitor (CFF).

In my simulator it also plays a role in the output impedance (low frequencies), I came up to 47µF !

The LT3015 Data sheet says : CFF ≥ 10 nF/100µA • IFB-DIVIDER

 IFB-DIVIDER = VOUT/(R1+R2)

In my case IFB-DIVIDER = 14V5/(1.8k+19.6k) = 0,68 mA

CFF  ≥ 68 nF

Is 47µF far too much ?

Should I limit this capacitor to 100 nF ?

What about the LT1963a, can I do the same ?

Thank you,

Jean