Other Parts Discussed in Thread: TINA-TI, TL3474A, LM124, LM324, LM224, LM2902
Hello team,
I am supporting an application where an LM224A is oscillating - typically I would do a simulation on TINA-TI but it does not seem like we have the LM224A has a SPICE model, so I was hoping for some feedback, this is some additional information:
"The output of the op amp is a 50Hz/60Hz sine wave that rides on a 2.5V offset, with a range of 0V – 5V. I noticed some oscillation on the trough of the sine wave, approximately 10% of the sine wave amplitude in magnitude. I believe that the oscillation is due to the protection diode network that is directly connected to the op amp output." ..."The capacitance of the network is 40pf (x2) when the output voltage is at 2.5V, but the capacitance changes with voltage in either direction from 2.5V. The 2.5V point on the capacitance vs. voltage curve just happens to be at the knee of the curve. I have tried some different techniques to suppress the oscillation but nothing has proven effective thus far."
"I found the TL3474A, which can drive 300pF and remain stable (according to the data sheet). I need to something low cost but is rated for -40C. Would this be my best choice?"
Is there any recommendation you could provide to improve stability or another Op Amp which might be able to drive the 40 pF load and that is a low cost and rated to -40C?
