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INA213: IN+ and IN- connection

Betty Guo
Expert 7300 points
Part Number: INA213
Other Parts Discussed in Thread: TPS62130

Hi team,

in the INA213A datasheet, the IN+ is connect the supply side,  IN- is connect to load side.

but in the A/N of SLVA657, the IN+ connec to load side while the IN+ connect to supply.

can you help clarify which one is correct?

  • 0
    Guru 140200 points

    Hi Betty,

    like this?

    betty_ina213.TSC

    Kai

  • 0 in reply to kai klaas69
    TI__Mastermind 23225 points

    Betty,

    Kai has provided a great visualization here of how the INA213 behaves in in SLVA657.

    The answer is both are correct design implementations, but most likely for your application, you will want to stick to the datasheet for your design.

    Regarding SLVA657, note that the REF pin is set to VOUT0, so that at light load ~0 condition, the output will be ~VOUT0, and as the load current is measured in this direction, this output voltage drops rather than grows. This inverse behavior is needed in the design due to their feedback control scheme, as the output of the INA213 is controlling the FB node of the TPS62130.