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Old 24th June 2009, 10:50 PM   #1
aris69 is offline aris69  Italy
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Join Date: Jun 2009
Question Tpa3122d2 Class D Audio Power

I've built an audio amplifier based on TPA3122D2 and it sound is very good.

I've two questions:

the 10uF capacitor connected to pin 17 and ground (see figure 28 datasheet) i not find a ceramic or polyester, is good a 10uF electrolitic capacitor? (my amplifier sound without it)



My amplifier in configurated in SE with two 8 ohm speaker impedence. I use a 47uH filter inductor and 390 nF filter capacitor (see table 3 datasheet), the DC blocking capacitor is 470uF for 40Hz filter response. (table 2 datasheet)

well my question is: what is the function of the two 4,7K resistor paralleling the my 390 nf capacitor ( 690 nF in the figure 28 for 4 ohm application) and the 4,7K values is good for my 8 ohm application? what is the best value of the two resistors for 8 ohm speakers?

Thanks

Excuse for my bad english.
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