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TPS54260启动不了,冒火花

Other Parts Discussed in Thread: TPS54260

第一次使用TPS54260,输入33.8V(交流24V半波整流后得到),要求输出12V,出现TPS54260第3脚及9脚冒烟,打火花的现象,也没有输出。谁有遇到过吗?怎么解决呢?