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INA199: Current sensing for 24V battery

Part Number: INA199

Dear Sir:

                          We used INA199 for current sensing of 12V/24V battery(shunt current) and we connect V+ to 5V from LDO and connect REF pin to GND and Out pin connect to ADC. When we tried to do short test for battery , then LDO and ADC had damage , What's wrong for our test? Do you have any suggest to us? BTW , If INA199 's common mode voltage out of range ,such as 28V or 32 V , Does INA199 will be damage? The components around the INA199 will be damage?

Jason

  • Hello Jason,

    Thanks for your choosing to use Texas Instruments in your design. Did you apply the 28V-32V common mode voltage before your short test? If you violate the absolute maximum ratings of the part, such as having a common mode higher than 26V, you will break the part and risk breaking the surrounding components.
  • Dear Sir:

                  If INA199 work on low side current sensing , Does it need to consider common mode voltage? BTW ,  we repeatedly test condition of battery short , INA199 had damage , Is due to it over current 5mA into input pin?

    Jason

  • Hi Jason,

    when cabling is involved inductive kick backs and bouncing can occur. I would protect the inputs of INA199 as shown in section 8.4.4 of datasheet. Eventually connect Schottky diodes in parallel to the TVS to limit the negative going input voltages.

    Kai