Hi,
For one of my classes, I need a 140 uA constant current source, and the way I have it configured is:
+10V connected to V+ (pin 3)
481 ohms between pins 1 and 2
V- (pin 1) connected to a load, and the other side of the load connected to -10V
The +/- 10V is from a TPS61093 chip configured in figure 16 of its datasheet. To simulate loads, I attached a few different resistors between V- and -10V, and while 481 ohms should provide 140 uA, I'm getting results that are way off:
32.8k -> 540 uA
56.1k -> 329 uA
82.6k -> 228 uA
Why would this be happening? I switched out the chip and I unfortunately get the same behavior.
Thanks,
Anthony
