INA138 to INA139 LTSpice Simulation Adjustment

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ACharnley

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There's a TI model for the INA138 which works well and a much more complex TI model for the INA139 which doesn't work at all. I need the latter for the higher bandwidth and being a simple current sense chip have been looking to modify the values.

INA139 has 1K resistors on the input and INA138 has 5K.

Is it simply a case of modifying R11 and R20 in the attached lib? I ask because there's also another value at 5K, R20, and my best guess is it's to limit the max current going through the 1N1673.
 

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First, thanks for making the asc file, I still haven't working that side of ltspice out.

So I dumped it into a project but the simulation gets stuck. My hacked INA138 to INA139 file is working, though slow as hell. My CPU is certainly burning watts on it.
 

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At 166kz it will be slow no matter what. But the TI model design doesn't help either.
 
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I made a small change to the lib file. Try this.
It sims much faster but still slows down at 60ms. I think that's caused by the circuit design.
 

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