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Class D Switching Power Amplifiers and Power D/A conversion

Which 2.1 TPA3116D2 to go for?
Which 2.1 TPA3116D2 to go for?
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Old 22nd December 2014, 01:33 PM   #1
perceval is offline perceval  Taiwan
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Default Which 2.1 TPA3116D2 to go for?

Looking for a TPA3116D2 to play with, I have access to a few, some with OP amps, some with caps, ... it can be hard to navigate through the lot and quite easy to get lost!

Don't have much experience with class D amps, so turning to the "pros"

Here's a short list of some of the 2.1 boards available, in 50W+50W, +100W.
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Old 22nd December 2014, 03:04 PM   #2
smile2 is offline smile2
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Where can you buy the 4th amp?
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Old 22nd December 2014, 03:17 PM   #3
perceval is offline perceval  Taiwan
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They are all available to me locally... in Taiwan.
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Old 22nd December 2014, 03:30 PM   #4
irribeo is offline irribeo  Netherlands
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4th only with short speakerwires, then probably most interesting one
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Old 22nd December 2014, 03:33 PM   #5
perceval is offline perceval  Taiwan
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This one? Short speaker wires? Meaning not a long run between the amp and the speakers? I may need about 2 meters of cable between amp and speaker.
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Old 22nd December 2014, 03:58 PM   #6
irribeo is offline irribeo  Netherlands
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I believe TI specifies ferrite bead filter is within FCC (how is radiolaw where you live?) with twisted speakerwires till 1.5 or 2 meters. In Japan it is probably not legal, very strict laws there This board has FB on output, so no peaking outputfilter with any speakerload, also less distortion and better efficiency?? probably, if chip isn't tempted to become a radiotransmitter
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Old 22nd December 2014, 06:13 PM   #7
ForenSeil is offline ForenSeil  Germany
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Couldn't you simply put it in a metal case?

Quote:
Originally Posted by perceval View Post
This one? Short speaker wires? Meaning not a long run between the amp and the speakers? I may need about 2 meters of cable between amp and speaker.
But cables have less resistance than thin copper layer on the PCB I guess (?)

Last edited by ForenSeil; 22nd December 2014 at 06:16 PM.
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Old 22nd December 2014, 06:26 PM   #8
irribeo is offline irribeo  Netherlands
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Yes maybe when you keep speakers and all wires within case too. In Japan would say: only allowed for laboratory usage
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Old 23rd December 2014, 07:06 AM   #9
perceval is offline perceval  Taiwan
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Are there any boards allowing an adjustable crossover?

Most of those boards just let you adjust sub output volume and mains L/R output volume, then overall volume. Meaning the full range of frequencies are sent to both mains and sub lines.
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Old 23rd December 2014, 07:58 AM   #10
doctormord is offline doctormord  Germany
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Quote:
Originally Posted by irribeo View Post
I believe TI specifies ferrite bead filter is within FCC (how is radiolaw where you live?) with twisted speakerwires till 1.5 or 2 meters. In Japan it is probably not legal, very strict laws there This board has FB on output, so no peaking outputfilter with any speakerload, also less distortion and better efficiency?? probably, if chip isn't tempted to become a radiotransmitter
Well, measuring the TPA3132D2 (Simililar to the 3116/3118) with only fb-filters transmits some "noise" but not that much to worry about.

(Measured at PVCC=20V with 8Ohm speaker at 0.7m speaker wire, HMS3010, HZ551 probe at 1m distance)

Amp on, idle:
Which 2.1 TPA3116D2 to go for?-26_300mhz_amp_diff_freq-png

Those "peaks" are just harmonics of the switching frequency, better seen here:

Amp off:
Which 2.1 TPA3116D2 to go for?-34_50mhz_amp_off-png

Amp on (idle):
Which 2.1 TPA3116D2 to go for?-1_50mhz_amp_on_idle-png
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File Type: png 26_300MHz_amp_diff_freq.png (15.6 KB, 402 views)
File Type: png 34_50MHz_amp_off.PNG (8.9 KB, 398 views)
File Type: png 1_50MHz_amp_on_idle.PNG (9.4 KB, 398 views)
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