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请教一下DCR011205怎样才能正常输出



我按照产品手册中下图连接,输入12V直流,同步端悬空,输入地和输出地是接一起的,没有带负载,用示波器测量无输出电压,打开和关闭Vin电源时会有一个短时的5V脉冲,请为什么会这样,问题出在哪里?