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ISO7741: 两个隔离器串联后的电压分布

Part Number: ISO7741
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?