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ADN8831 VTEC LFB-SFB

Question asked by hideo on Oct 19, 2015
Latest reply on Oct 20, 2015 by ytu

Hi,

I'm using ADN8831 tec controller.

The temperature control seems very well, but I have what I cannot understand about the chip signals.

I measured the VTEC at the pin30 as 2.10V. I measured the voltage between LFB and SFB as well and the LFB-SFB was 4.04V.

The VTEC value 2.10V meant LFB-SFB=3.40V.

((2.10-1.25)/0.25=3.40.

Does anyone know the reason why the voltages were different?

When the VTEC was lower than 1.25(LFB-SFB<0), the voltage values were almost same.

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