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Differential amplifier with amplification

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?

Reply to
sonnic...
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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.

Reply to
John Larkin

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

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Reply to
Lasse Langwadt Christensen

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