:> did i ask OT question?
: No, merely ambiguous and without context. You gave no indication of what : you're trying to accomplish, what you have now, what it's doing that it's : not supposed to do, what it's not doing that it _is_ supposed to do, that : sort of thing.
: What _do_ you have now?
LDO = Low Dropout Regulator. The original poster is having a problem where the transient response of his LDO is varying with supply voltage, resulting in an "improper" transient response.
To answer the original poster's question (with a question): How are you compensating your amplifier?
"Improper" transient response seems like a problem in your compensation. Generally, you would compensate your amplifier by putting a gigantic cap. on the output of your regulator, making your output pole the dominant pole. You need to make sure that the output pole remains the dominant pole over all supply voltages (i.e. the gm of your output/pass device will increase with supply, moving your output pole to a higher frequency. This could cause your first-stage pole to become to dominant pole, and result in the "improper" transient response that you are seeing, depending upon the resulting pole locations.)
If you are not putting a gigantic cap. on your output, you need to spend lots of time figuring out how you will effectively compensate your regulator.
Good Luck,
Joe