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Maximum Speaker Impedance for SSM2306?

Question asked by Ed1632 on Aug 31, 2016
Latest reply on Oct 23, 2016 by iamPhil

I am working with a prototype board (not the AD Dev board) of the SSM2306. The part seems to work fine driving an 8 Ohm speaker, but when I connect to our 40 Ohm (16 mH) headset driver I get only a repeated clicking sound. 

My speculation is that the higher voltage is being detected as a turn on pop and suppressed, but that is just a guess. I have also tried a couple of other class D IC's from various suppliers, and gotten similar results from about 2/3 of my samples. The ones that seem to work are the ones with no features...

For this application I am more interested in the simplicity and footprint than the pop suppression, but pop suppression (if it really works) would be a bonus.

 

The most likely culprit is of course user error of some kind, but I don't understand why a lower impedance speaker wiuld fix it. Has anyone else had this problem? Does anyone have any insight on how I can go about picking out a power amp for a 40 Ohm driver beyond ordering sample after sample and trying them?

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