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TPS54360损坏

Other Parts Discussed in Thread: TPS54360, TPS2378

我设计了一个非隔离POE模块,采用PD芯片TPS2378,和DCDC TPS54360,带载3.5A,但是实际调试带载2A,TPS54360就会损坏,而且SS56 SMB也会短路。用示波器测试SW电压,最高才50V,求教大神给点分析建议。下面是TPS54360的原理图,PCB板是两层板,带载1.5A时,电感的温度为66℃左右(常温)