I have a problem when powering on with TI UA7815 while applying unregulated 20V DC to the input. The +15V (A21-3) from UA7815 will have about 10ms delay compare to -15V(A22-3) from the scope shot below. Is there anyone know what causes this and how to avoid it? Thanks.
+15V is voltage waveform from A21-3 which use TI U7815C (The is no time delay if Fairchild LM7815C is used.)
-15V is voltage waveform from A22-3 which use ON 7915CT