TPA3116D2 Amp

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#7,663
#7,665
I switched to a 12v smps supply On mu YJ tpa3116d2 from Astron Linear supply
And it has a much more balanced sound from top to bottom.
My Astron RS 12a is new and modded with upgraded capacitors throughout.
My take is these amps prefer a switching supply to a linear supply
To my ears for sure.
 
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#7,666
gmarsh said:
I'd create one from scratch, it's something you want to learn how to do anyway. Upper left of page 39:

http://www.ti.com/lit/ds/slos708d/slos708d.pdf
Click to expand...

Gonna stick with the one I created. But just want to clarify the meaning of the dimensions in slos708d, I mean the ones with two figures.

Are they min/max tolerances? The only one which would matter is the width as it might alter distance between pads from side to side!

As I have a spare 3116 without avcc leg now I can desolder from board and compare against a printout of pcb footprint.
 
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#7,667
stanleyburbick said:
Anyone know where to find the tpa3116 package for the schematic/pcb footprint? A link would be useful!

Think I remember it being the 3118... But can't seem to find it now I want to!
Click to expand...

TI has full Gerber files for EVM board on their website. You could just download it and have one of those companies in China make the PCB per EVM spec.
 
#7,668
xrk971 said:
TI has full Gerber files for EVM board on their website. You could just download it and have one of those companies in China make the PCB per EVM spec.
Click to expand...

Nah.... my board sounds nicer than evm. 😉

rethink on china boards, as found maker in uk for about same price if i solder IC.

just asking about the htssop DAD footprint, but think print off of my created component matches ok.
 
#7,670
Hello everybody! I've found this forum via Google and it looks to be most competent place in TPA3116D2 amplifier things. I'm facing a strange problem, explanation for which I can't find anywhere!

I've bought this board from ebay: 50WX2 Official Version Finished TPA3116D2 Class T Digital Power Amplifier Board | eBay

Connected it to adjustable 10A bench supply, set voltage 20V, connected 3 way, 50w, 4 ohm speakers and used Lumia 822 phone as music source. The voice is crystal clear, with everything sounding just fine, but it is too low! approximately 5W, regardless how loud I make output on my mobile phone.

So I thought that my mobile phone might not be able to provide full juice, so I've connected professional grade function generator to input (can drive 20W into 50ohm load up to 20mhz), and scope im parallel with speaker (tried both channels, result is the same). When I apply 1khz sine to input and slowly rise input level, output voltage on speaker pins rises up to about 5v peak to peak, then, no matter how hard I push input, I only see clipping and distortion on scope. Tried to play with supply voltage - no luck, board draws about 0.15A @20V.

So I decided to modify gain resistors, set them to 75ko and 47ko, as datasheet says. Output voltage immediatelly raised to 10v peak to peak, which is already good. Thought I've solved the problem, reconnected the mobile phone, put up some music and found a strange thing - if volume is loud enough, and theres some heavy bass line in the melody, amplifier suddenly decreases output power about 5 times, and continues to work in this mode, untill I cycle the power.

I've connected generator and scope again, and started watching. I can have 10vpp @ 1khz, but when I lower the frequency, at about 200hz that "protection" kicks in, lowering the output module.

Power supply output is stable, but I've soldered 2x2200uf 25VDC LowESR capacitors directly to board - no difference.

So what can be a reason?
is the board defective, so I should request an refund?
 
#7,677
Connected non-inductive resistor with 4 ohm resistance to output, again, connected probe and generator. Vpp is about 9 volts, above that I see distortions on scope, but there are no jump downs and power decreases, when loaded on resistors. What I noted is, at about 1khz and above, with resistors as load, output inductors "sing". Current consumption is 1.95A 20V (Single channel load).

Now I'll do the frequency swipe and see how output voltage changes.
 
#7,678
There's no dependency on input frequency - power jumpdown does not occurs on any frequency from 10hz to 20khz. However, I was able to reproduce it, when loaded on resistors, when I've switched oscillator output to square wave - I see current consumption rises, and in about 3-4 seconds the amplifier enters limited power mode, about 6vpp.
 
#7,679
You seem to be debugging with all the typical known things I would have tried. This is very odd as the "fake YJ" Blue Black amp you are discussing has been around for a while and never heard this problem. I have one and it plays loud just fine. The fact that the inductors "sing" or make noise tells me there may be a bad inductor issue. Are they hot to the touch? Should run fairly cool. Try swapping inductors or switching out no inductor just for test to see. Check solder joints on chip pins to board (use magnifying glass). If there is a cold solder joint on one of the main output pins it will limit power.
 
#7,680
This is my 3rd Class D amp and it's again junk, previous ones were YDA138 and PAMxxxx (forgot detailed name) based amps.
My ancient, 2xTDA2030A BTL amp outputs much louder sound than this one.

I will capture snapshot of amplifier board using thermal camera and post it here shortly.

So if there's some issues with amp, are they serious enough, that I can request a refund?
 
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