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INA250: suggested gains for output current range

John Chou62
Intellectual 2090 points
Part Number: INA250


hi Team,

my customer wants to check TI's suggested part and Gain value for their different current output.

if the max output current is 

1. 2A

2. 40A

what would be the suggested part/Gains for the application?

- INA250A1:200mV/A

- INA250A2:500mV/A

-INA250A3: 800mV/A

-INA250A4: 2V/A

appreciate the help

  • +1
    Guru 140200 points

    Hi John,

    as mentioned in the datasheet the maximum measuring current of INA250 is +/-15A. So 40A is no option.

    Referring to the 2A measuring current: The INA250A4 gives an output voltage of 2V/A x 2A = 4V. But what part should be used depends on the desired output voltage range and the supply voltage, of course.

    Kai

  • +1 in reply to kai klaas69
    TI__Mastermind 23685 points

    John,

    Kai's answers here are pretty solid. He is correct that the device is only rated to a continuous 15A, and therefore INA250 is probably not the correct device for this application. As figure 31 of the datasheet points out, if the customer wishes to pass 40A through the device, it will survive for approximately 4 seconds before burning out the resistor.

    My next question from this is: are these current signals uncoupled from one another? I.e., is the customer needing to measure 2A and 40A in the same line, or are these two separate load lines, and therefore we can look at two separate amplifiers for measurement.