Other Parts Discussed in Thread: OPA171, OPA2990
I am using OPA171 op-amp for simple comparator operation.
Op-amp supply: +12V and -12V
Non-inverting terminal: 2.5V fixed reference (by voltage divider)
Inverting terminal: PWM input with 1KHz (0-5V)
Expected Output: Switched Output with +12V/-12V with 1Khz frequency (wrt to input PWM)
Issue: Non-inverting fixed reference is switching with respect to the input PWM frequency (0-2.5V). it seems to be abnormal to me. Experts please clarify if it is normal and why.
I have attached the circuit below. Please let me know if you need any additional information.