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INA226-Q1: Sensed Current Range

kura
Genius 4840 points
Part Number: INA226-Q1
Other Parts Discussed in Thread: INA226

Can customer use INA226 at following condition ?

Supply Voltage:12V

Shunt resister:25uOhms

They would like to measure Current up to 30,000A.

We found Sensed current range in below error analysis is up to 100A.

Please give us your comment.

  • 0
    TI__Mastermind 34220 points

    Hi,

    The INA226 shunt voltage measurement range is ±82mV, which translates to 3.28KA peak current with a 25uΩ shunt.

    For error simulation, what matters is shunt voltage which equals to current X resistance. The absolute values of current or resistance don’t matter. Therefore we can scale them proportionally to fit into the calculator.

    The above condition is equivalent to Shunt=2.5mΩ and current=0 to 32.8A. All you need to do is plugging these numbers into the calculator, just remember to multiply X-axis by 100 to reflect the actual current magnitude.

    Regards, Guang

  • 0 in reply to Guang Zhou
    TI__Genius 16440 points

    On additional point to keep in mind, is that the shunt resistor will have to be able to dissipate the I2R power.  To measure  30,000A, the shunt would need to be ~ 2.7µΩ; which is means supporting ~ 2.5kW.