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Bi-directional automotive current sense with an op-amp?

Robert Smith
Prodigy 715 points
Other Parts Discussed in Thread: CS-AMPLIFIER-ERROR-TOOL

Hello all,

I was wondering if there are any TI devices that could fit this design. I know I can use a specific current sense amplifier, but the issue is we don't need an ultra accurate measurement. The system would need the following

  • Automotive qualified
  • Input pins be able to withstand battery load dump conditions (32-40V)
  • Bi-directional current sense through a high side shunt resistor
  • 2% accuracy at 30mV signal

If you have any devices/configurations that you know of, id be interesting in hearing about them.

  • 0
    TI__Intellectual 1235 points

    Hi Robert,

    For current sensors, I would recommend INA186-Q1 and INA240-Q1, which are automotive qualified and fit the voltage range and bi-directionality requirement. 

    The accuracy will be determined by the current being measured and the shunt resistance. You can use the CS-AMPLIFIER-ERROR-TOOL linked here to calculate the error for these devices once you know the shunt resistance and current measurement range.

    Cierra