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ULQ2003A: ULQ2003A输出对地短路

Part Number: ULQ2003A

ULQ2003A有一路输出对地短路,输出端接的是继电器,该路电流不超过200mA,实际对继电器线圈检测的电流为150mA左右,请问造成短路的可能原因是什么呢?谢谢!