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ISOW7841: ISOW7841 Viso output is pulled down to 1V

Part Number: ISOW7841

1.I test ADUM6400 is ok use above circult.It can appear Viso pulled down to 1V when I test ISOW7841 use the same circult,the measured current is 80mA cann’t exceed 130mA,but it is OK when unconnect load,pls help provide some suggestions,thanks

2.VBUS input is 5V/1A,Viso is 3.3V