Getting 0.9Amps instead of 4A using TNy290KG

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Hi, 

I have designed 5V 4A power supply. As per the design obtained from PI expert online. followed every step right except for the transformer core as I used EE20 instead of suggested EE22 core. The problem now is I can load upto 0.9 amps after that power supply shuts down. used TNY290 SO version. Please suggest the possible solution

thanks in advance