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LM25117调试问题---【急急急】!



大侠们:

              请教一下为什么这个电路上电调试一段时间后,输出电压与VCC引脚电压一致, 输入ULVO引脚电压5V左右正常,但是SS引脚无电压、HB引脚无驱动信号。  是否该芯片一致处于SANDBY模式,还是芯片坏了?  请指教,谢谢!