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INA260: motor jitters when using your part

Robert Anton
Prodigy 10 points
Part Number: INA260
Other Parts Discussed in Thread: INA240

Tool/software:

Hi,

My motor jitters when using INA260 to measure its Current.

Does your part work in PWM ?

My motor is 24VDC, driven by PWM between 10% and 100%, and its current (in test mode at no load) is just around 300mA. (and this is when is jittering); and at max load is expected to draw about 7 Amps (didn't test this to see if it jitters or not).

How do you use INA260 in TRIGGERED mode?

The question is NOT how to set it in triggered mode, but what actually is the Trigger that commands another reading?

Thanks.

  • 0
    TI__Mastermind 26425 points

    Hello Robert,

    There are a lot of factors that can affect if the INA260 can work in a PWM environment or not, such as frequency and voltage levels. Generally, this device would not be a great pick for PWM applications. One primary reason for this is that the inductive kick-back can sometimes cause the voltage to drop below 0V, and the INA260 can only withstand -0.3V on the input. Because of this we recommend using devices that can withstand negative voltage on the common mode. The INA240 and INA241 are both specifically designed for PWM applications, so you may be interested in one of those. Our TMCS devices can also withstand negative voltages, but with your low currents, the INA's will provide a more precise measurement. 

    For the INA260, to trigger a conversion, write to the Configuration Register with the desired trigger in the MODE bits.

    Regards,
    Mitch