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INA790B: High-Current (200A) High-Side Current Sensing ICs

Conor
Guru 10990 points
Part Number: INA790B
Other Parts Discussed in Thread: TMCS1123, , RES11A

Tool/software:

Hi,

We are currently evaluating TI's current sensing ICs and would like to seek your advice on suitable solutions for our application.

[Background / Inquiry]
We are looking for an IC that can measure high-side DC output current up to 200A with high accuracy.
Initially, we considered INA2181A3IDGSR (external shunt type), but since the total system accuracy (including the external shunt) does not meet our requirements, we are exploring alternative solutions.

Currently, we are reviewing the following products:

  • TMCS1123 (Hall-effect sensor)
  • INA790B (integrated shunt type)

We are especially interested in INA790B due to its high accuracy with integrated shunt, but we understand that INA790B is rated for up to 75A at 25°C.

Thus, we are seeking alternative solutions that can accurately measure up to 200A, if available.

[Sensing Conditions]

  • High-side current sensing (voltage rails: 65V and 48V)
  • Maximum current: 200A
  • High accuracy required (including total error from internal/external shunt)

If there is no high side solution, please suggest a low side solution. We would greatly appreciate it if you could recommend suitable devices and any relevant reference circuits.

Best regards,

Conor

  • 0
    TI__Mastermind 32320 points

    Hi Conor,

    As you probably found out by now, we don’t have an integrated-shunt product that can  measure 200A. I think the way forward is to use external shunt.

    Regards

    Guang

  • 0 in reply to Guang Zhou
    Guru 10990 points

    Hi Guang,

    Could you recommend a device for an external shunt resistor solution?

    Also, for highly accurate measurements, would you recommend a solution that combines RES11A and a current sense amp?

    Thanks,

    Conor

  • +1 in reply to Conor
    TI__Mastermind 32320 points

    Hi Conor,

    The current is too high for RES11A. For 200A, I’m guessing a shunt smaller than 1mOhm is needed. Of course the final selection depends on other factors. This video goes into more details on this topic.

    INA296 appears to be a good fit given the constraints. We do offer an error calculation tool, which can be handy and can be downloaded here.

    Regards

    Guang