v_c said:Are you talking about cross regulation? That is when for example, +5V and +12V are outputs of a secondary side of a transformer. So the regulation of one voltage effects the regulation of the other.
Are you talking about loading or regulation? This is where a 5V output in a linear regulator with 12V input is effected by how much current is drawn at 5V output.
A TL431 may be used in this circuit to provide a 2.5V reference in conjuction with a voltage divider.
Can you give some more information?