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LM5160A: LM5160A buck circuit stability problem

Part Number: LM5160A
Other Parts Discussed in Thread: LM5160DNTBK-CALC, LM5160


below is the SCH for the buck circuit design using LM5160A, input voltage is from 40V to 60V, the problem is: the inductor temperature is very high even when the load is small or none. 

the SW waveform is as below when there is no load added:

add some loads about 80mA, SW waveform and output ripple voltage is as below:

it's the stability problem.

I use TYPE3 ripple configuration.

The parameters of RON(R4=681k) , RA(R1=402k), CA(C1=3nF), CB(C6=10nF) are from Webench power designer, also i calculate these values based on application note AN-1481. No problem was founded.

can anyone help to look at this? any feedback is welcome.