XTR115: XTR115

Amruta Bhujbal67

Part Number: XTR115

Hi,

I am using XTR115 for conversion of PWM to 4-20mA.In which I will give 0 to 2.2 V at input resistance of XTR115 , using Input resistance and resistance between Vref and Iin pin I will control 40-200uA current at input side.I get correct result when I connect load resistance 100E or less than 100E but not get correct result when load resistance geter than 100E. So kindly guide me how to choose load resistance and what is minimum and miximum load resistance I can connect at output side.

over 7 years ago

0 Tim Green1 over 7 years ago

TI__Expert 6275 points

Please post a complete detailed and readable schematic along with power supply voltage and loop receive resistor value range you are trying to accommodate. Also PWN frequency, duty cycle and filtering you are using into XTR115.
XTR115 is a 2-Wire Transmitter. See below to make sure a 2-Wire Transmitter is what you need versus a 3-Wire Transmitter.
e2e.ti.com/.../part-2-two-wire-4-20-ma-transmitters-background-and-common-issues
e2e.ti.com/.../two-wire-4-20ma-transmitters-background-and-common-issues-part-4

0 Zak Kaye over 7 years ago

TI__Mastermind 23050 points

Hi Amruta,

It sounds like you are running into compliance voltage limitations on the output. The following blog post describes how to determine the maximum load resistor for your design: e2e.ti.com/.../two-wire-4-20-ma-transmitters-background-and-common-issues

0 Amruta Bhujbal67 over 7 years ago in reply to Zak Kaye

Intellectual 390 points

Hi,

Thank you Zak for your valuable guidance every time. I had checked with different value of load resistance and get correct result.

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XTR115: XTR115