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LM2679: LM2679T-12/NOPB design review please

Part Number: LM2679
Using LM2679T-12/NOPB, a circuit that outputs 24V input to 12V/5A was constructed. 
Measuring the output terminal measures 12V.
However, when a load of 12V/1A is applied, only about 3V to 4V is output.
What's wrong with my circuit?