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Dear, Sir.
My customer is applying INA193A-Q1 for their system, now.
They use it under V+=5V, and Rs value is detemined to consider the
the peak of normal loading current level & Gain.
So, the peak of volatge output is closed to V+ -0.2V.
At this time, They are asking under over current for load situation such as
several times of the peak of normal loading current.
1. I think the output volatge will be clipped at V+ -0.2V during over current.
I wonder my assumption is correct?
2. Is there no concern about the over current duration(clipping time) to consder
the heating or anything alse?
Please give your advice.
Best Regards,
H. Sakai
Hello H. Sakai,
Your assumption that the output will clip to V+ -0.2V when input shunt voltage is beyond the full-scale range (250mV) of device is correct.
There is no concern for heating during output saturation.
There is one behavior that should be noted though. Once input voltage (Vshunt=Vin) exceeds a couple Volts, the output will collapse to 0V. This is because internal BJTs will experience a phase crossover. Once Vshunt increases to several volts, the output will rise back up to (V+)-0.2V. You can read about this behavior here:
https://e2e.ti.com/support/amplifiers/f/14/t/772408?tisearch=e2e-sitesearch&keymatch=ina196%20output
Best,
Peter Iliya