• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 47 subscribers
  • Views 1407 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

Current sensors selection

Mickey Zhang
Genius 12080 points
Other Parts Discussed in Thread: INA250, INA169

Hi Team,

The customer needs the current sensors. Those are 20A/12V ,20A/48V , 15A/12V and 15A/48V. Please recommend the suitable IC.

Thanks,

Best Regards,

  • 0
    TI__Genius 15760 points

    Hi Mickey,

    Can you please provide more information about the application and requirements?

  • 0 in reply to Mayrim Verdejo
    TI__Genius 12080 points
    Hi Mayrim,
    Sorry, the customer does not give me any other information. I recommend him INA250. INA250 can detect 15A.
    But I don't know how much INA169 can detect the current. Can you tell me how INA169 detect the current and how much INA169 can detect the current?
  • 0 in reply to Mickey Zhang
    TI__Genius 15760 points

    Hi Mickey,

    Basically you could detect 15A, 20A with any of our current shunt monitors. The limitation of our INAs are based on Vcm, Vs and Vshunt. As long as the customer select a shunt resistor that in combination with the load current do not exceed Vshunt spec of the device they should be fine. 

    INA250 and INA169 are different devices. INA250 specify the maximum  load current because it have integrated shunt, so the load current is limited by that shunt resistor in this case. INA160 is a current output current shunt monitor with NOT integrated shunt. The customer can select the shunt resistor appropiated for its applications requirements. 

    In order to provide a basic recommendation please find out the following:

    • Vcm: What is the desired common-mode range?
    • Output Type: Do they have a voltage, current, or I2C output preference?
    • Configuration: Low side or high side sensing?
    • Offset: What kind of accuracy they need?
    • Vs: What is the supply voltage?
    • Package: IC size?

    See, below, an example of how INA169 works. I connected a 20A load with a 10m ohm shunt resistor. This create a differential voltage of around 200mV. As the INA169 is current output device, you need to connect a resistor in the output to set your gain. In this circuit the gain is set to 20V/V with a 20kohm resistor. This configuration gives us 4.0V at the output. This configuration meets device spec.

    For Current Shunt Monitors training material please visit: