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BQ7694芯片供电电压Pin9电路设计异常

如下图,b7694 BATT为十四节电压50V. C5分压得到17.5V,即Q818 G极为17V,不过实际通电测试过程中,发现S极已经达到45V,MOS处于反偏状态,而且Pin9也已经超过规格书的36V。这个设计还没有错误?