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INA302: Application/ data sheet possible typo.

Naser S.
Genius 11605 points
Part Number: INA302

Customer is exploring the options available in INA302. They are planning to use the IC for over current and undercurrent detection. They have 50 units to be tested at a time and have the current ranging from 1A to 30A to be measured. He was doing the calculation and came across the Rsense selection section. Can he uses one Rsense for all the varying current limit?

He observed a mistake in table 2 of the data sheet the VOS_ERROR_MAX shown is 0.48% which  he believes is wrong . He gets 0.98% when he recreates the calculation. This also leads to confusion whether to choose same part or not.. But primarily he wants to know whether they can implement 1A to 30A measurement in one IC using DAC methodology. Thank you

  • 0
    TI__Mastermind 24395 points

    Hello Naser,

    Depending on the percent error your customer can accept in the measurement, he could use one Rsense for that range.  However, the lower current will definitely yield a larger error.  To quickly determine I would recommend using the Error Analysis tool located on the right side of the INA302 product page.  Below is an image of what that tool looks like.  There he can put in his operating conditions and quickly assess if the error will be acceptably low enough.

    As for table 2, you are correct, that is a typo.  The Error_Available should be equal to (Max acceptable error)-(ERROR_initial) = 2.5%-2%=.5%.  Thereupon sqrt(Error_Avaliable^2-E_G^2)=sqrt(.5^2-.15^2)=.47697