Hello,
I have found a problem with XTR300 spice model. In my simulation with the spice model that downloaded from TI webside, the IA input is measured too high bias current in a range from 40uA to 50uA according to different resistance at input. The datasheet states the input bias should be less than +/-35nA. Could anyone have a look on this problem?
The other issue I'm trying to solve is too low slew rate in constant current mode while the load is in open state. I expect the voltage will ramp to the rail in a short time such as <1mS in typical slew rate. But the actual response is the output takes about 50mS to the rail. I realized this might be restricted by the low current from internal IMON current. In open load case or a high resistance load, the IMON is 1/10 of the load current which will be very low current in even nA or uA leven. The compensation capacitor in typical 47nF is too high to drive with so low current. I'm tying to solve this issue by external compensation loop with OPAMP. Anyway I hope this issue can be noted in datasheet descriptions.
Thanks,
Neil