XTR117: XTR117 (0-10V to 4-20mA)

Tool/software:

Hey,
I have tested this circuit on a sample 2-layer PCB and verified that everything is properly connected to the XTR IC. However, after making all the connections, the IC is heating up excessively. I am unable to debug the issue and determine the cause.

Currently, the circuit includes a BC817K transistor, but I also have an MMBTA28-7-F, which can be used as an alternative.
VO1 is coming from the another board which is generating the 0-10V signal, on same board we have analog current input circuit where IO1 is connected. 
From same board we have provided the 24V loop and IRET Gnd connection.