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LM5008: How to solve lm5008 problem with loads?

Part Number: LM5008

Hello !!!

Im working on a Project uses lm5008 to convert a variable 16-60 VDC to 12 VDC . I have designed the following circuit according to datasheet and 1925 evaluation board. 

The output is very good without load . But when I add a resistor as the output the voltage drops . The strange thing is that the output when i add the load to the circuit when it is on is different from the time I start the loaded circuit.