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LM27403 Unstable condition Problem

Other Parts Discussed in Thread: LM27403, LM27403EVM-POL600

Hi guys,

I design a board With LM27403 Switching according to its user's guide. my Design is completely match with LM27403EVM-POL600 but my pcb specially inductor become very hot and my output get unstable. Vfeedback is 0.6V and My output DC voltage is correctly but an ac Spike with frequency of Switching (500KHz) appear in Vout.I check LG, SW and HG signal and all signals is same with user's guide Figures but this signals have jitter. I Doubt on MMBT3904T Transistor. can you help me how to solve this problem?!