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ADN8831 Cooling Problem

Question asked by EngStu on Feb 27, 2015
Latest reply on Oct 7, 2015 by NidhiSingh

I recently started testing my ADN8831-EVALZ board for its heating and cooling control ability.I am currently using a 10k NTC thermistor. I can successfully heat the target device. However, when I try to cool the device to a temperature of 5 degrees celsius, the TEC current decreases slowly, but the target temperature increases similarly. Also, the TEC current polarity does not reverse.

 

Can anyone give suggestions to get a cooling current?

 

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