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ADN8831-EVL TEMPOUT discrepancy

Question asked by NidhiSingh on Oct 1, 2015
Latest reply on Oct 26, 2015 by ytu



I am using ADN8831-EVL to stabilize temperature of my laser diode. I am using single setpoint configuration but there is a problem with TEMPOUT voltage. According to the datasheet TEMPOUT voltage should vary between 2.5V (Vref)  and 0V (ideally 50mV) but voltage at this pin is 5V (input voltage to the board). Also the board is giving maximum set cooling current (500mA) every time irrespective of the thermistor value and not changing the polarity i.e. it is not supplying heating current at all.

Please let me know what could have gone wrong and how to fix it.



Nidhi Singh