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TPS54335 DC降压输出大于1A电流烧掉

各位,谁用过TI的TPS54335  这个IC,我使用它做一个5串锂电的5V DC输出,按照规格书上设计它支持4.5V-28V输入。我输入接入8-10V电压时,先开启小电流测试,5VDC 0.1A-1A都很稳定,但是我负载2A的时候,就直接烧掉了。规格了里面不是说TPS54335支持3A电流的吗,还是我买成其他参数的IC了。求救啊