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Hi Bhanuka,
There should only be a max of ~24mA flowing through the zener. I do not think that would heat it up much. Can you check for soldering issues? In addition, please measure the current from your loop power supply as well as the voltage drop across Z1.
Thanks,
Paul
I checked the circuits and finally found the issue. I was trying to implement a 4-wire , 4-20mA loop with DAC161S997 and connected the GND of circuit was also connected to the power supply.
In my case, I am unable to power the micro-controller and other circuitry with loop power as it consumes more tha 4 mA.
Please let me know if there is any possibility to implement 4 wire , 4 - 20mA loop with this IC.
Hi Bhanuka,
You must implement a "floating" supply for the current loop, or have discrete grounds. It is probably easier to get a floating supply first, as the grounds can be difficult if you are using instruments or MCUs connected to a computer, as they might short the grounds together.
Thanks,
Paul
Hi Bhanuka,
The LOOP- will always be a lower potential than ground and the potential will depend on the current in the loop. That means that your power supply scheme must allow LOOP- ≠ GND. Most benchtop supplies already floats, you just have to avoid connecting LOOP- to earth ground.
Thanks,
Paul