TPS568215: Inductance value

Hello

I have a question for inductance selection of TPS568215.

I want to use an inductance as small as possible.

Then I tried to use 0.2uH (fsw=400KHz) for 1.2V out, but the control loop was not stable and 3.0V instead of 1.2V was output.

Using over 0.35uH seems to be good from my test.

Question 1)

I know there is recommended component values in the datasheet(Table 5 in SLVSDI8A).

But there is no information about possible inductance range.

Could you please tell me the smallest inductance value that can be used ?

Question 2)

I want to understand technical background of this selectable range for inductance value.

Is it impossible to open this kind of technical background information?

Regards,

Oba