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Article: Using thermistors in temperature-tracking power supplies.(Technology Information)
- Article from:
- EDN
- Article date:
- August 2, 2001
- Author:
CopyrightCOPYRIGHT 2001 Reed Business Information, Inc. (US). This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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SIMPLE LINEARIZING SCHEMES MAKE IT EASY TO USE THERMISTORS TO IMPLEMENT VOLTAGE-REGULATOR DESIGNS WITH TEMPERATURE-DEPENDENT OUTPUTS.
MOST POWER-SUPPLY REGULATORS, by definition, provide an output voltage that is stable despite variations in line (input voltage), load, and temperature. However, a temperature-dependent output voltage is an advantage for some applications. This article provides a tutorial, a design procedure, and circuit examples that use NTC (negative-temperature-coefficient) thermistors in temperature-tracking power supplies.
By far the most common application for temperature-dependent regulation is in LCD-bias supplies, in which the ...