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UC2842A: Output load adjustment rate bad

Part Number: UC2842A

The schematic diagram is as follows.

Design requirement: Input 85-265VAC and output 12V 2A.

Currently, during testing, it was found that the output load adjustment rate is relatively poor, and the output decreases at 240mA. Could you please advise if it is a design issue and what causes it? Looking forward to your reply. Thank you~