Other Parts Discussed in Thread: ISO7842
ISO7741与ISO7842串联后,两个隔离器会各分到多少电压。SLLA469提到隔离器串联可以增加爬电和电气间隙,但是串联后的VIORM是多少?ISO7741的VIORM是1500V,而ISO7842是2121V/2828V.假如工作电压是1800V,会不会两个隔离器不均压导致ISO7741失效?
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您好,
已经收到了您的案例,调查需要些时间,感谢您的耐心等待。
如果我理解正确的话,你是在问一个标准,该标准规定使用多个相同的隔离器来增加爬电。没有具体的标准来规定这一点,而是取决于客户的应用程序。正如应用程序说明中提到的"Solutions to meet the higher automotive isolation creepage & clearance needs",有时客户可能需要更多间隙来满足存在异常环境条件的应用(如下所示):
总体而言,客户的终端设备标准决定了防止电弧和保持信号完整性的爬电要求。
图片中就是下面的一句话:
But when you consider the higher altitudes, the atmospheric pressure drops causing the breakdown through air easier than at sea level. This requires the device leads to be moved further apart to prevent arcing, thereby increasing the clearance requirements.