Over-Temperature Switch

  
The output goes high when a preset temperature is exceeded. A fixed half-supply reference voltage feeds a reference
Over-Temperature Switch - schematic

current to the inverting input, and a variable current is fed to the noninverting input. Resistor R6 is a negative-temperature-coefficient (NTC) thermistor, so the potential at the junction of R5 and R6 rises with temperature. The op amp will switch high when that voltage exceeds the half-supply value. The trip temperature can be preset via R5.




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