The LM3911 Basic Temperature Controller Circuit is schemed in the diagram below. With features such temperature
stable voltage reference and op-amp in a single monolithic chip, IC
LM3911 provides a highly temperature controller device.
this basic temperature controller circuit, LM3911 can be circuited to
be such these typical applications i.e Proportioning Temperature
Controller, Basic Thermometer for Negative/Positive Supply, Temperature
Controller With Hysteresis, Thermometer With Meter Output, Electronic
Thermostat, Differential Thermometer and more.
Get and see full pdf document to see those typical applications of this temperature controller device in the LM3911 datasheet (source: national.com)