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Figure 11. AC load diagnostic example in practice

Figure 11. AC load diagnostic example in practice

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FDA2100LV



Diagnostics functional description

Figure 9. AC load diagnostic result representation considering the impedance Z in

the complex plane (Lfilter = 10µH)



Note:



Lfilter = 10 µH Cfilter = 3.3 µF, VCC = 14.4V; setting: low gain, amplitude option 2, LC output

filter selector = option 7; phase options according to the subtitle.

On the end, any load variation (from normal AC load to AC open load, but also to AC short

load) can be considered detectable if its representation in the complex plain correspond to

passing from zone orange to zone blue, (or vice-versa) in one of the many possible

diagrams.

Practically, considering a 2 way speaker system, to find the right setting for AC diagnostic

you have to know the impedance in phase and module at frequency Fac in normal

conditions, for example 5 ohm 15 deg.

Then disconnect the tweeter and measure phase and module at Fac, suppose 14 ohm

75 deg.

Rev 1



31/61

60



Diagnostics functional description



FDA2100LV



Figure 10. Impedance phase and magnitude frequency plots of a 2 ways speaker

system

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Figure 11. AC load diagnostic example in practice

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