Other Parts Discussed in Thread: OPA4191, LM7705
Hi teams,
Hope you are doing well. I want to build a PV voltage sensing circuit with TLC2274. However, with simulation, I found that when with single power supply, output voltage changes non-linearly with the linear input rising. See pic 1.
I also simulated the circuit in TINA, the file is attached. The same issue occurred in DC analysis. However, OPA4191 works normally.
Configuration for TINA:
TLC2274: (Abnormal) OPA4191: (normal)
VDD+=5V. VDD+=5V.
VDD-=0V. VDD-=0V.
Vs1=5V. Vs1=5V.
Vo=127.23mV. Vo=37.5mV.
TLC2274: (Abnormal) OPA4191: (normal)
VDD+=5V. VDD+=5V.
VDD-=-5V. VDD-=-5V.
Vs1=5V. Vs1=5V.
Vo=37.09mV. Vo=37.5mV.
So, my question are below:
1, what the root cause of the non-linearity of TLC2274. why opa4191 can work normally.
2, why with -5V in VDD-, the circuit can work normally.
Thanks and BRs,
Marsh Cai.
