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LM5175: high voltage(100V) extension questions

Part Number: LM5175
Other Parts Discussed in Thread: LM5177, LM5118

Dear dear,

I am trying to extend LM5175 in/out voltage to 100V level.

Circuits like external gate drivers with 100duty support, dedicated 12V into VIN, external high side current sensor connected to ISNS(+)(-),  etc are OK by now.

But there is no enough info about VISNS and VOSNS,

Q1: Can I connect VISNS VOSNS to const 12V(VIN)?

Q2: or, Connect VISNS to const 12V(VIN),  connect VOSNS to VOUT(100V) through voltage divider to make sure that voltage is less than maximum ratings?

Q3:  Is there additional explanation about VISNS and VOSNS, like sink current and Input Impendence specifications?

Thanks!