Before we can offer more suggestions, its time you tell us what is the secondary AC voltage of the 220V transformer you are using.The most difficult problem is I don't not know which chip can meet my requirement...
That's about as bad as using a capacitor rated for 50v in a circuit that's measuring 53v!I waited a bit to see if anyone spotted the use of 1N4008 for the 2 Amps output current requirement.
Apparently no.