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cdsteinkuehler
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bobc
I'm confused by your comment though, the TLV431 isn't intended to generate 3.1V, but to sink current if the voltage on OV_REF exceeds 3.1V. That was my understanding of how the protection circuit is supposed to work anyway.
Yes, it's a standard shunt regulator (basically a fancy zener diode).
My comment relates to the fact it appers the output is supposed to be 3.1V, but the resistor divider (between the 10K source resistor and the 2.5K reference resistors for the TLV431) is set to generate 2.4V. So the TLV431 won't start shunting current to regulate the voltage until something else brings the voltage above 3.1V. The only thing that can do that here would be the thermistor lines themselves, via the protection diodes, but I don't think that's really what is intended.
Yes, that IS what is intended, e.g if the thermistor input is accidentally connected to 12V.