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LM5116-HT: Facing issue with inverting Buck boost converter (LM5116-HT)

Part Number: LM5116-HT
Other Parts Discussed in Thread: LM5116

we used LM5116 Inverting buck boost in our design as per the TI WEBENCH reference. we are facing issue with that converter, it is not working as per expected. 

input voltage : 28V

output  : -15VDC/3A

issue: the output of the converter is not stable, it is oscillating with the 4K hz frequency. we are using compensation and other component values maximum same. please Provide any simulation is available and provide better solution.