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high voltage sense ic ? (example lmc6001 amc1301 ~)

Other Parts Discussed in Thread: SN6501, LMC6001, AMC1301

Hi Ti

I develop high voltage dc.dc converter. my circuit operate very well.

but high voltage sense circuit has some problem. spec of high voltage condition(2nd output) is Vpk -7000(worst condition) ,  normal Vnormal -5000(general condition) ) , very stable dc(lower 100hz).

now i design lmc6001b /  inverting opamp circuit + sn6501 isolation power circuit. it operate very well. but lmc6001 circuit has some nonlinears.

i use only resistor ladder 1v : -7000v --> 1k : 7M resistor ratio , inverting opamp. i want to enhance a high voltage sense circuit.

if i use lmc6001 continuously , is there any reference material to get linear characteristics of circuit(doc, reference , anything!)?

or if i change amc1301 , do i use only resistor ladder? or Ti offer other opamp?