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UCC21520: 自举电容,控制时序问题

Part Number: UCC21520

 +HV为400V,Q1给1K的频率 50%的占空比,Q4为高,中间负载为20K电阻,我想问的是这样控制Q1的自举电容失败,Q1一直处于关闭状态,请问下这个控制方式对吗?