Oven_temperature_controller

Published:2009/7/24 2:46:00 Author:Jessie | From:SeekIC

Pig. 13-27 This circuit shows a precision temperature controller for a small-component oven. When power is applied, the thermistor (a negative TC device) is at a high value. A1saturates positive. This forces the LT3525A switching regulator output low, biasing Q1. As the heater warms, the thermistor value decreases. When the inputs balance, A1comes out of saturation and the LT3525A pulse-width modulates the heater via Al, completing a feedback path. The 2-kHz pulse-width-modulated heater power is much faster than the thermal-loop response and the oven sees an even, continuous heat flow. Linear Technology Linear Applications Handbook, 1990, p. AN5-1.



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