LM3911_TEMPERATURE_CONTROLLER

Published:2009/6/24 4:21:00 Author:May | From:SeekIC

The LM3911 requires only a few resistors and a capacitor to tum into a full-function tem-perature controller. The LM3911 requires very few external components to implement a full-function temperature controller. The figure illus-trates the sirnplicity of the freeze fighter circuit.The resistor network consisting of R1, R2, and R3 is used to provide the set point voltage for the feedback input of the LM3911.Resistor R4 limits the current through the in-ternal voltage reference of the LM3911 and can be selected from a wide range of values. 7.5 kQ is specified in most of the application notes.Resistor R5 pulls the output of the IC high when the temperature is below the set point. The internal resistor is in series with a diode that al-lows a switching voltage up to 35 V to be used with the device.



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