顶不住了,大家拉兄弟一把啊............(如图)

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上电时VCC为20V,5秒钟后切换为12V,3842正常工作,但是6脚没有输出..无法驱动开关管....测量数据:
          1脚8V,
          2脚2V,
          3脚0V,
          4脚2.4V,
          7脚11V,
          8脚5V.

拉兄弟一把啊.........