Tool/software:
Looking to see absolute maximum current output capability of the XTR300. The XTR116 discusses how to increase maximum output current with parallel resistor to increase maximum output current to 45mA (max).
Can the XTR300 support +/-40mA current output capability? If so, is there an equivalent modification to the reference design (TIPD155) to achieve this?
Hi Jeffrey,
The XTR116 (two wire current transmitter) uses a very different topology than the XTR300 (three wire current transmitter).
The XTR116 is a two-wire current transmitter, where most of the current flows through an external NPN bipolar transistor, and its possible to place resistors in parallel with the internal RLIM resistor to extend the output current to a maximum current of less than <45mA. Nevertheless, the device linear range for the XTR116 is specified for the span from 250uA to 24mA.
The XTR300 is a three-wire current transmitter that does not require an external transistor. All of the output current flows to the output stage of the XTR300, and the linear range is specified up to ±24mA. If you set M2=High, the current limit is typically ±32mA, but can vary across devices with a minimum of ±25.5mA to a max ±38.5mA.
A discrete voltage-to-current circuit could be implemented using a discrete amplifier for a range of ±40mA, but the XTR300/XTR305 current transmitter devices are specified for accuracy at the ±24mA range.
Please let me know if you have questions.
Thank you and Kind Regards,
Luis
