A precise constant temperature controller circuit without temperature jumping area

Published:2011/7/4 20:46:00 Author:Borg | Keyword: temperature controller, temperature jumping area | From:SeekIC

The be knots of Q1 and Q2 are used as the temperature sensor. The 2.5V highly stable Vref is provided by the precise regulated integrated circuit U3(TL431) as the reference input of the window voltage comparators (U2C,U2D) and difference amplifier (U1C). The connection of U1A and U1B is for debugging and the balance of the input impedance of the amplifier. The voltage follower U1D works as the buffer separator, which sends the temperature differential voltage Vd, which is amplified by U1C, to the non-inverting terminal of the voltage comparator U2B.



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