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TPS7B4250-Q1 The overshoot at power up

Hi,

 

I have a problem of the overshoot at power up.

When  the ADJ terminal is rised , it is the overshoot is as large as 6.5V.

Then ADJ is 5V , Iout is 25mA, Vin is 16V and output capacitor is 1uF.

For slew rate is high, it seems to output been reached over 6V  before the softstart will work .

I think that output capacitor should be large.

How should I decide to do the size of the capacitor?

 

Best regards,