5V 1A power supply using ALTAIR04-900TR

[MVERM.4]

i have made 2 pieces of 5V 1A power supply using ALTAIR04-900TR  as per the circuit design in eDesignSuite.

Now as i power on one of them it blow the fuse and rectifier in AC input. i tested for any sort of short circuit but i did't find and again i places new fuse and rectifier and power it on but again it blow the fuse and rectifier.

other one is giving maximum 450ma out put .

please suggest the possible reason of fault and remedies.

Thanks