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Class D Switching Power Amplifiers and Power D/A conversion

TPA3116D2 Amp
TPA3116D2 Amp
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Old 9th September 2019, 04:03 PM   #11151
Think is offline Think  Netherlands
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Join Date: Nov 2017
Location: Den Haag, Holland
TPA3116D2 Amp
Default MOD for red mono board

Quote:
Originally Posted by jfetter View Post
I use a 3 ohm load, ie two KEF UniQ10 in parallel.
They are each slightly under 6 Z.
I use the $3 tpa3118 module with 24vdc mean-well 100w.
...
You mean TPA3116? As TPA3118 won't like the 24V and 3Ohm load.

If you use the board with the red pcb; most (all?) have a production fault which can be fixed. See TPA3116 D2 mono amplifier as a stereo system?
Just removing R2 and cutting the chips leg is easier then swapping R2+R3 see TPA3116 D2 mono amplifier as a stereo system?

Last edited by Think; 9th September 2019 at 04:16 PM.
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Old 9th September 2019, 05:11 PM   #11152
jfetter is offline jfetter  Costa Rica
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TPA3116D2 Amp
The die is same, 24v and 3 ohm no problem.
It actually is 'cooler' when playing loud vs idle.
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Old 9th September 2019, 05:50 PM   #11153
jfetter is offline jfetter  Costa Rica
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TPA3116D2 Amp
I soldered copper spreader, works great.
Cheap TPA3118D2 boards, modding them and everything that comes with it
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File Type: jpeg copperhs.jpeg (672.1 KB, 336 views)
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Old 11th September 2019, 02:42 PM   #11154
outoflock377 is offline outoflock377  Lithuania
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Hello guys,

Can I use this transformer with a rectifier+filter to power a TPA3116D2 board (which accepts 12-24V)?


Specs of the transformer:


Primary: 0V....220V
Secondaries: 32V.....0V.....32V
19V....0V.....19V
0V....38V
Power rating: 100 VA





19V secondary seems to be the most suitable but it's on the edge. 19 * 1.414 = 26.866V DC but after rectification this should drop to 25.x V maybe. But isn't that a bit too much?


Also, will I be able to squeeze full 100W out of the board? 100/19 is 5.26 A which seems enough current but my formula could be wrong. This is my first time doing something like this so that's why I'm asking here.
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Old 11th September 2019, 06:00 PM   #11155
easp is offline easp
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Quote:
Originally Posted by outoflock377 View Post
Also, will I be able to squeeze full 100W out of the board? 100/19 is 5.26 A which seems enough current but my formula could be wrong. This is my first time doing something like this so that's why I'm asking here.
What is the impedance of the speakers you plan to use these with? That'll determine the peak power you can get at 19v.
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Old 11th September 2019, 06:43 PM   #11156
jfetter is offline jfetter  Costa Rica
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TPA3116D2 Amp
I believe transformers are speced at load, so the 19v is more like ~22v for no load design margin.
22 x 1.4 = 30.8vdc no load.
Filter caps 50v.
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Old 11th September 2019, 07:09 PM   #11157
outoflock377 is offline outoflock377  Lithuania
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Quote:
Originally Posted by easp View Post
What is the impedance of the speakers you plan to use these with? That'll determine the peak power you can get at 19v.

1 subwoofer speaker at 4 ohms. It's a mono subwoofer board. I'm currently using a 19V 3.4A old laptop charger but I'm looking for an upgrade in power and I also want to get rid of slight buzzing when nothing is playing. I suspect the laptop charger I'm using right now is not really good quality.


Quote:
Originally Posted by jfetter View Post
I believe transformers are speced at load, so the 19v is more like ~22v for no load design margin.
22 x 1.4 = 30.8vdc no load.
Filter caps 50v.

Well, if that's true then this transformer is probably not suitable. I guess I have to measure the AC output from 19V before proceeding any further.
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Old 12th September 2019, 05:54 AM   #11158
chermann is offline chermann  Austria
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Hi

the TPA3116 can handle in operation 24V and should be not exceeded. So every version of transfomer which give more after rectifire and caps is useless.
use an smps with 24V or a transfomrer with 15VAC--> 15 *1,41 = 21.5V. the factor 1,41 is after rectifier and cap unloaded. the better the diodes (shottky) your voltage is mores stabel unload-loaded. lets say older rectifier brdidge "waste" a little more....
the transfomer with 18V = 25V unloaded. the max of TPA3116 is 26VDC

19VAC tranformer is really unusal - 12V -15V -18V -24V

chris

Last edited by chermann; 12th September 2019 at 05:56 AM.
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Old 12th September 2019, 05:57 AM   #11159
chermann is offline chermann  Austria
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If you want to use the 19VAC trani then use a other amp / chip = TDA7498E
chris
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Old 12th September 2019, 06:04 AM   #11160
Turbowatch2 is offline Turbowatch2  Germany
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This transformer is not good at all for your intended purpose. The ampere rating is the same for the 32, 19 and 39 volt winding, so if you have 100VA/39 V = 2.5 A.
Which makes it a 19V x 2.5A =37,5 VA at best, most probably less. Got to see data sheet or measure under load. Often additional voltages have even less, as they are only intended for some low power stages.

Please donīt decide that "your SMPS" is high quality. Just try another one, it might not buzz. You can not judge a power supply from the outside until you have intensly measured it.
If you need more power, which is a very subjective demand, look for another amp and use a dedicated supply. not a left over from a laptop or printer.
For example a TDA7497e with a 36 Volt 5-7A SMPS. All together for about 30-40 US$ inc. P&P at AliBaba ot ebay.
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