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XTR110 not working properly

raj balraj
Prodigy 20 points
Other Parts Discussed in Thread: XTR117, XTR110, XTR115, XTR116

i designed a circuit which converts 8 bit digital data to 4 to 20mA transmitter. In the datasheet it is mentioned that we need to use the mosfet IRF9513.I did not had the IC in indian market. so i used an alternate ic IRF9520 in which the current raring is greater than the previous mentioned one.As a result i am not getting the exact current 4 to 20mA. i tried to adjust 4mA span adjustment thro' a potentiometer,but it didn't help.pls tell me how to solve this problem.

  • 0
    Guru 21975 points

    Raj,

    I doubt that substitution of the IRF9520 for the IRF9513 is the problem. Many different P-channel MOSFETs could be successfully used.

    A common mistake made with the XTR110 is to attempt its use in a two-wire transmitter application. Two-wire operation is required when the transmitter is circuitry is powered from the receiving side. In this situation only two wires connect to the transmitter circuitry (no ground and no power supply connections). The XTR110 cannot be used in this type of application. If this is the type of circuit you are designing, consider XTR115, XTR116 or XTR117.

    Regards, Bruce

  • 0 in reply to Bruce Trump
    Prodigy 80 points

    Hello Bruce,

    I bought at XTR 110 recently.

    I am a final year engineering student studying in Mumbai.

    We are working on a pressure control system.

    Our aim is to convert 1-5 Volts to 4-20mA( using a DIP package IC ) and the XTR110 fits in application perfectly. Hence we bought it. SOon after I stumbled upon this post, where you said that using an XTR110 with a two-wire application was a common mistake.

    Frankly I did not understand. Can you please help me by explaining it?

    I will be connecting the 4-20mA current to a Watson Smith Current-to-Pressure Converter. It converts an input of 4-20mA to an equivalent pressure of 3-15psi, using a constant input of 20 psi pressure.

    Here is the device:

    http://www.norgren.com/ws/resources/2006-114+Type+100x+Datasheet+-+Issue+a+Draft+2.pdf

    I hope the XTR 110 works, since we have now almost entirely exhausted our budget, and may not be able to afford another expensive IC,being students.

    Looking forward to your reply.

    Thank you sir.

    Sincerely,

    Shaival.

  • 0 in reply to SHAIVAL SHETH
    Guru 21975 points

    Shaival,

    You are using the XTR110 in the correct type of application.

    The XTR110, a three-wire transmitter, is used in mains-powered equipment to send a 4-20mA signal to a remote device. Often the remote device is an actuator of some type such as in your case.

    A two wire transmitter IC is used in a remote sensor. The sensor circuitry gets its power from the voltage on two wires provided from the receiving-side equipment. The two-wire transmitter sends its signal information by modulating the current that is drawn from the two wires.

    Regards, Bruce.

  • 0 in reply to Bruce Trump
    Prodigy 80 points

    Hello Bruce,

     

    Thank you for your reply and the explanation.

    I am glad we have chosen the correct IC.

     

    Thank you again.

     

    Shaival