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XTR110

eliyanto budiarto
Prodigy 40 points
Other Parts Discussed in Thread: XTR110, XTR101, XTR108

Hello all,

I am practicing the circuit  to convert 0-5 Volt input to 4-20 mA using XTR110 and its sample circuit mentioned on the datasheet. But, when i measured the output on the Drain pin of IRF9513 the mA current is run-out up to 150 mA. Is there any body inform me what is the problem ?? I am trying to get the article about two wire and three wire current loop but cannot get it.

 

Appreciate for your kind suupport.

Eliyanto-Indonesia

 

 

  • 0
    TI__Guru 62935 points

    Hello Eliyanto,

    I'm sorry you're having trouble with the XTR110.  Although it will be a good read, I'm not sure that the article about the differences between two and three wire circuits will be appropriate here if you've followed the application circuit in the datasheet. 

    This circuit is a tested and working circuit so my first suggestion would be to double-check all of your connections to the XTR110 and verify that they match the circuit in the datasheet.  Please be sure the supply voltage is in range:  13.5V - 40V, and verify that the P-channel MOSFET is connected properly.

    If your design is on a printed circuit board it would be great if you would share the schematic so I can look at your connections as well.

    Thanks,
    Collin Wells
    Precision Linear

     

     

  • 0 in reply to Collin Wells
    Prodigy 40 points

    hello Collins,

    Yes, i have did mistake in my wiring and now i have fix it but it made one of IC is spoiled. Is there any information how to purchase it IMMEDIATELY ?? Since when i am looking at FRANELL / ELEMENT14 Catalogue there is no XTR110 chip listed, they only put XTR101. I need two more ICs.

     

     

    Thanks & regards

    Eliyanto-Indonesia

  • 0 in reply to eliyanto budiarto
    TI__Guru 62935 points

    Hello Eliyanto,

    Perhaps you could try ordering a few samples from the TI.com website sample system.

    Regards,
    Collin Wells
    Precision Linear

  • 0 in reply to Collin Wells
    Prodigy 40 points

    Collins,

     

    How long the signal can travel without any drop ? Is there any special instrument cable impedance should i use to maintain the signal can be travel up to 300 meters.

     

     

    Thanks & regards

    Eliyanto

  • 0 in reply to eliyanto budiarto
    TI__Guru 62935 points

    Hello Eliyanto,

    Kirchoff's Current Law states the the current flowing in a closed loop will be the same at any point in the loop. Therefore to answer your question there will be no drop in the loop, we've heard of customers running these cables a mile (1600m) or more. The main issue to concern yourself with will be to ensure that the impedance of the cable + the resistive load does not create a voltage that is outside of the compliance range of the XTR110.  Basically ensure that the total resistance of the cable and load will not create a voltage that is over the compliance level of the XTR110.  In a 4-20mA system, the worst-case will be at the 20mA level so ensure that (Rcable + Rload) *20mA is less than the compliance voltage of the XTR110 which is power supply (Vcc) dependant.  The figure below is from the XTR110 datasheet and shows the maximum resistive load vs. the Vcc voltage for both 20mA and 40mA levels. 

    Please let us know if we can help further.

    Regards,
    Collin Wells
    Precision Linear

  • 0 in reply to Collin Wells
    Prodigy 40 points

    Dear Collin,

     

    Appreciate for your detail answer in the meantime i have no more question.

    Regarsd,

    Eliyanto

  • 0 in reply to Collin Wells
    Prodigy 180 points

    Hello,

     

    my name is Juliana and I'm working with the XTR108 device. I would like to know if this curve posted before is valid for the XTR108. I'm trying to figure out what is the maximum value of R_L to maintain the current loop.

     

    Thanks in advance.

     

    Juliana

  • 0 in reply to Juliana Campos Silva
    TI__Guru 62935 points

    Hello Juliana,

    This question was answered on another post, see below:

    http://e2e.ti.com/support/amplifiers/precision_amplifiers/f/14/t/151904.aspx

    Regards,
    Collin Wells