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ISO5851: Outputs do not turn off when needed

Part Number: ISO5851

Hello,

I am using ISO5851 to drive some Mosfets (IXFN180N25T).  They are configured into four half-bridges.  The inputs on the chip seem to be getting pulled around.  My circuit uses the sample circuit shown in the data sheet with a bi-polar isolated DC supply.  Does anyone have experience with this chip?  Any advice or pointers will be greatly appreciated.

Thank you,