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shunt current sense amplifier

Devayani Bodar
Intellectual 255 points
Other Parts Discussed in Thread: INA199, INA181, INA213

Dear Team,

Please let me know the solution for below requirements;

1. Shunt current monitoring - Bi-directional range +/-100A maximum

2. Low side monitoring

3. Operating voltage up to 100VDC

4. Good quality & Low cost solutions

Thanks,

Devayani Bodar

  • 0
    TI__Mastermind 22650 points

    Devayani,

    Unfortunately it's not so objective to "solve the system," as there are several other care-abouts that I would need to know to do this. For example, do you need the output to be analog or digital? Do you need reaction hardware, such as comparators, in the system to respond to overcurrent or undercurrent events? 

    What I can share with the information given above is that you should be able to make a great many of our bidirectional amplifiers work, as if you are implementing on the low side, the load will be taking the 100V operating voltage you mention, and the common mode voltage seen by the device will be approximately zero.

    If you are looking for low cost, I would start by examining the INA181, which is a cost optimized, low side capable bi-directional device with analog output. If you need greater precision, you could also look at the INA199 and INA21x series (i.e., INA213). If you need additional features as I mentioned above, please let me know, and I can make additional recommendations.

  • 0 in reply to Carolus Andrews
    Intellectual 255 points

    Hi Carolus Andrews,

    Thanks for clarifications, Can I use INA28x for my requirements?

    1. Shunt current monitoring - Bi-directional range +/-100A maximum

    2. Low side monitoring

    3. Operating voltage up to 100VDC

    4. Good quality & Low cost solutions

    Thanks,

    Devayani Bodar

  • 0 in reply to Devayani Bodar
    TI__Mastermind 22650 points

    Devayani,

    Yes, INA28x should be able to work here. That said, the challenge you will have here is with resolution vs. thermals. What level of resolution do you need to be able to detect inside this 200A window? At what supply voltage are you planning to operate the device?

  • 0 in reply to Carolus Andrews
    Intellectual 255 points

    Hi Carolus Andrews,

    supply voltage is maximum 72V and resolution is not critical here and we will see what is best possible to achieve with this device.

    Thanks for your support, We will update you progress.

    Thanks,

    Devayani Bodar