Differential amplifier with amplification

Jun 19, 2023 Last reply: 3 years ago 2 Replies
S

Hi



I need to measure a load on 14V line, using say 10 (or 100) milli-ohm resistor. I want to get an output like 0-4V for 0-4A load. A small offset of 1V is acceptable. Even 0-2 or 1-3 or 0-8V for the load is acceptable.



I have an op-amp working on 12V.



I have been calculating on a differential amplifier. I am limited, that I need to divide the 14V to at maximum 11V or even 10 to be within working limits of the op-amp. Say 100K and 270K will do that, which limits me in amplification to ~27.



I can add an amplified after the differential amplifier but is there a better option?


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J

INA281A3 is cool. Hang it across a shunt resistor. It has a huge common-mode range, -4 to +110 volts.

It would be tough to make a diffamp that good.

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L

mandag den 19. juni 2023 kl. 10.37.02 UTC+2 skrev snipped-for-privacy@gmail.com:

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