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TPS23750带隔离12V1A输出电路问题

如图为带隔离的输出12V1A的官网推荐电路,我按照此电路设计后,样板接上交换机网线后输出一点反应都没有,输入也没信号,整个芯片都没有工作,不知道问题出在哪里,麻烦帮忙解决下;用DC电源50V直接供电也无反应,DC输入端直接被拉到2V左右;