App note: Using thermistors in temperature tracking power supplies

Here’s a tutorial from Maxim describing thermistors and how to use them in temperature tracking power supplies. Thermistors are resistors whose resistance changes with temperature, increases with PTC type and decreases with NTC.

This article provides a simple, intuitive tutorial on negative temperature coefficient (NTC) thermistors and how to make basic use of them in general, and specifically in power supply regulators. A good example application is their use to cancel temperature effects on LCD display contrast. Two simple NTC thermistor linearizing techniques are shown, and regulator design procedures and examples demonstrate their application. Each example includes a schematic and compares the measured output voltage versus temperature to the target.

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  1. Float charging lead acid batteries commonly uses fixed voltage and varies the current according to the state of battery charge, however the most suitable voltage varies with temperature. The exact same circuit can be used to optimise voltage regulation for float charging lead acid batteries (note the thermistor has to be sited near the battery).

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