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LM51551: Power Supply :Flyback Isolated

Part Number: LM51551

Power Supply :Flyback Isolated 

Input voltage: 19v - 20v - 21v      

Output voltage: 56V : 0.54A

Transformer: EFD20  AE: 27mm^2

Please help design the schematic diagram!Could you help me design the parameters for LM51551?thank you