• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 49 subscribers
  • Views 671 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

INA219: INA219

Hani Darwish
Prodigy 100 points
Part Number: INA219
Other Parts Discussed in Thread: INA240, INA181, INA180

Hello,

I am using INA219 to monitoring an actuator(24 volt) and  the current ( 0 to 10 A) based on the load , the actuator is controlled by PWM(Pulse Width Modulation).

I am using R shunt = 0.02 ohm.

So I am asking is this IC able to measure the current form(0 to 10A) of the actuator that controlled by PWM.

 

  • 0
    TI__Mastermind 21720 points
    Hello Hani,

    Thanks for using our forum. For PWM current, we typically would not recommend the INA219 unless the PWM was very slow. For high-side and in-line implementations, we would recommend the INA240. For low-side, we would recommend using the INA181. However, for these you will need an external ADC. What frequency and duty cycles are you using for the PWM?
  • 0 in reply to Patrick Simmons
    Prodigy 100 points

    Hello Patrick,

    thanks for your support. I am using duty cycle (%96). and the calculated frequency will be 63 Hz at (%96).

  • 0 in reply to Hani Darwish
    TI__Mastermind 21720 points

    Hello Hani,

    As the INA219 is one of our older devices, we did not characterize it for large step responses on the input as might be found in other datasheets like the INA180 (figure below).  This also indicates that it was not a chief concern in the design at the time.  Therefore it may not handle an input that quickly steps up from ~0V to 24V in a <(1/63s*4%/10=15.8us) time span.  This operation could result in sudden or progressive device failure.  Alternatively, the settling time may make it impossible to measure the current correctly when the PWM is low.  Therefore I would use one of the devices I recommended above.