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Value of Cfb for TPS71501

Hello

in the data sheet for TPS71501 the figure for the adjustable version shows a capacitor across the feedback resistor, CFB, but gives no guidance for selecting a value

can you help please ?

my feedback resistor is 1.86M and resistor to ground is 1.00M (3.45Vo)

i need to use the adjustable rather than the fixed because of system tolerance stack ups and an AD convertor, in fact i will be need to be including a trimmer as part of the  the 1.86M resistor, yuck !