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LMV358: hysteresis and schematic double check

Wesley Huang
Expert 1030 points
Part Number: LMV358

Hi team，

 

For commercial reasons, I have to choose LMV358 as the first stage comparator plus one stage inversion, and can not add any type of transistor. Specific applications are as follows:

  1. IN+ is connected to a reference source of about 0.15V, which is divided by a resistor. IN- is an NTC resistor. We hope that when the voltage of IN-is from 0.6V to 0.15V, the output signal of the first stage of the op amp will jump, and after the second stage of the op amp reverses, another jump wave will be output.
  2. Attached is my demo circuit, the simulation results look OK,but we are worried that when the voltage of IN- rises from 0.15v, there is oscillation. Could you please help us to add hysteresis circuit in the first stage to solve this potential problem?
  3. Could you please help to double check this circuit and find other potential problems of the circuit and provide suggestions for improvement?  Jackie.TSC

 

Best Regards

Wesley Huang