Over-Temperature Switch

Posted on Jul 4, 2012

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

Over-Temperature Switch
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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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