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关于ucc28600输出问题请教一下

Other Parts Discussed in Thread: UCC28600

ucc28600的VDD我是用外部的供电给了13.5v,然后上电后ss脚电压为0,开关管也没有驱动波形,截图是我的原理图有点模糊,现在问题是不知道芯片为什么不工作,麻烦大家给点建议和批评,谢谢啦