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LM22677: Adjustable LM22677TJ-ADJ

Part Number: LM22677

I'm developing a power supply that should range between 1.5V ~ 18Vdc using LM22677TJ-ADJ / NOPB and a micro controller.
I have success when the output voltage is between 3.5 ~ 18V with the load consuming between 1 ~ 2A, but when the set poitn is below 3.5V the output is oscillating between 2 and 8V ..
I have already changed RT between 47K to 200K with the value of 220K being more stable.
I have already changed L1 between 12 and 15uH, with the value 12uH being more stable.
Now I do not know what to do, please help me.


Circuit below.