Schematic Check Please: TPA3016D1

chico1st · 13th June 2011, 09:06 PM

Hi this is a schematic for my TPA3016D1 build. Any comments are welcome.

-I am planning to connect the signal and analogue ground under the chip on the power pad as recommended.
-All of the power caps which are >1uF are electrolytic (should I be looking for a special type?)
-All caps <1uF are X7R low ESR ceramic caps
-I dont know what to use for the output inductor (33 mH with ~1.7 A through it). Someone gave me a recommendation to wind my own for high current but 1.7A is quite low. I would like to use surface mount if anyone has recommendations.
-I chose to have a fault turn the chip off and didn't connect fault to mute (which restarts the chip).
-It mentioned that I should 'shutdown' the chip first before powering off to avoid a "pop". I didn't know how big of a deal this was so I ignored it.

gmarsh · 13th June 2011, 09:45 PM

I'd add a low value (10 ohm) resistor between the audio input ground and the board ground.

Also, I'd suggest just using a single ground plane for everything.

audiotest1 · 14th June 2011, 09:06 AM

INN have to grounded otherwise you will get big common noise .
c? = 2.2uF between INP and INN is too big , for simple tone adjust you can add 15nF CAP here.

chico1st · 15th June 2011, 04:06 PM

Quote:

Also, I'd suggest just using a single ground plane for everything.

the data sheet recommended having seperate ground planes and connecting them under the chip for some reason. (if anyone knows why that would make sense please tell me)

Quote:

I'd add a low value (10 ohm) resistor between the audio input ground and the board ground.

So i would have two 1Kohm resistors on the stereo to mono inputs of my audio in and a 10 ohm resistor from audio in ground to signal ground or power ground?

Quote:

c? = 2.2uF between INP and INN is too big , for simple tone adjust you can add 15nF CAP here.

That is true, based on the 32Kohm input impedance I could use a 22nF cap to have a 200 Hz high pass (I will have a number of caps since i dont know exactly where to cut the lows)
Again i suppose i should have a 15nF cap or so on the low pass to cutoff around 20kHz

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13th June 2011, 09:45 PM	#2
gmarsh diyAudio Member Join Date: Apr 2004 Location: Halifax, NS, Canada	I'd add a low value (10 ohm) resistor between the audio input ground and the board ground. Also, I'd suggest just using a single ground plane for everything.

14th June 2011, 09:06 AM	#3
audiotest1 diyAudio Member Join Date: May 2011	INN have to grounded otherwise you will get big common noise . c? = 2.2uF between INP and INN is too big , for simple tone adjust you can add 15nF CAP here.

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