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0-75mV to 5V dc amplifier

Maulin Nanavati
Prodigy 10 points
Other Parts Discussed in Thread: INA282

Dear All,

       I have a device which generate 0-75mV @ 0-10A, I mean when I have 0V it will have 0A and 75mV it will have 10A. I want to amplify voltage upto 5V but also decrease Ampere upto 250mA. Actully I want to measure ampere at periodically and keep watch on that it should not reach upto 0A. Is there any milivolt amplifier available? Please suggest. 

  • 0
    TI__Genius 14825 points

    Maulin,

    I'm afraid I'm not sure I totally capture your goals with this circuit, but I'll try to help.  Please feel free to clarify if I get something wrong.

    It seems like what you might want is a current shunt monitor with analog output.  A current shunt monitor will measure the voltage drop across a very small shunt resistor, effectively measuring the current through it by applying Ohm's law.  It can have voltage or current output, and can support large currents like 10A well.  Also in a current shunt monitor is a gain setting, which will amplify the voltage drop across the shunt for the output signal.  Common gain options range from 25 V/V up to 200 V/V, but many others exist and some are programmable and not fixed.

    The INA282 is a great current shunt monitor; it can support common modes of -14V to +80V, low offset and gain error, low offset and gain drift, and is available in gains from 50 V/V to 1000V/V.  If the gain doesn't produce the exact 0-75mV output you desire, you can always scale this down with a resistor divider and buffer that with an op-amp follower for robustness, if needed.

    We have many current shunt monitors available.  You can search for the ones with the specifications you need using our product selection web page, linked here: http://www.ti.com/lsds/ti/amplifiers-linear/current-shunt-monitor-products.page

    Thanks for using TI products!  Let us know how else we can help you.


    Jason Bridgmon