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LM5181: 12V ISOLATE Design

Part Number: LM5181

Hi:

    I am using LM5181 to design a 12V isolate power.The schematic diagram is as follows.I have a problem now, the output voltage is correct. but the output current cannot drive the load. The transformer Np:Ns is 4:1.R5 is 121K.Please help to check where is wrong