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Class D Switching Power Amplifiers and Power D/A conversion

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Old 6th October 2017, 06:12 AM   #11
eX Radikal is offline eX Radikal  Portugal
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Thank you in advance.
I had investigated all of the you suggested and all behave +/- the same: neither of them can deliver a clean 10w per channel with a 12V power supply (too much THD).
So, if I can't find a 10w per channel with (very) low THD, I'll probably buy a TPA3116D2 and somehow limit their output power to ~10w.
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Old 6th October 2017, 08:30 AM   #12
Yatsushiro is offline Yatsushiro  France
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How much is "too much THD"?

A TPA3118 may be a better starting point than a 3116.
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Old 8th October 2017, 03:57 PM   #13
eX Radikal is offline eX Radikal  Portugal
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I've seen 10%, so, very much distortion.
The 3118 isn't the same thing as 3116 except the heatsink can be used in the bottom and not in the top of the chip?
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Old 8th October 2017, 08:37 PM   #14
eX Radikal is offline eX Radikal  Portugal
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One more question, can anyone explain to me how the "commercial" speakers can use 3.7v batteries and get 20/30w of power? For example, JBL Charge 2/3. Are they using simple voltage boosters/step-ups?
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Old 9th October 2017, 05:45 AM   #15
saabaab is offline saabaab  United States
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Default Portable tpa3116d2 speakers

If you look up the popular XH-M190 version of the TPA3116D2 you will notice it has a volume control potentiometer built in. Set it about halfway up. If it sounds like the speakers are straining, turn it down. If it seems like they could use more power safely, turn it up.
Later on, when you find some better speakers, turn it up all the way.
If you are using 12volts, they will only be making about half their rated power anyway.
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Old 9th October 2017, 02:29 PM   #16
doctormord is offline doctormord  Germany
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Quote:
Originally Posted by eX Radikal View Post
One more question, can anyone explain to me how the "commercial" speakers can use 3.7v batteries and get 20/30w of power? For example, JBL Charge 2/3. Are they using simple voltage boosters/step-ups?
They do (JBL Charge 3) 2x10W into 4R. In BTL, this translates to 6.3Vrms or 8.91Vpk. So they boost to a moderate 10V i'd guess. This is, of course, peak power, so the battery needs to supply 2x10Wrms -> 2x20Wpk / 0.85 efficiency = 47W or 23.5W per cell. (Two cells are connected in parallel)

So, 6.35A per cell (peak) or 2.1C (calculated againt 3Ah capacity per cell)

These speakers use heavy psychoacoustic manipulation by DSP to "sound" like that.

Frequency response of the charge 2 is shown here:

Click the image to open in full size.

Source: Oluv's Gadgets: News: Finally! JBL Charge 2 - 1.4.1 firmwarefix

The JBL Charge 2 is working with a TPA3130, like shown here:

Click the image to open in full size.

Source: Oluv's Gadgets: News: Finally! JBL Charge 2 - 1.4.1 firmwarefix

The JBL Charge 2+ is rated at 2x7.5W

Last edited by doctormord; 9th October 2017 at 02:39 PM.
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Old 9th October 2017, 02:47 PM   #17
doctormord is offline doctormord  Germany
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The JBL Flip is using a TAS5709 with "dsp-like" effects using biquad:

http://www.ti.com/lit/ds/slos599a/slos599a.pdf

Source: https://1.bp.blogspot.com/-j0tTRTFsP...219_134619.jpg
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Old 10th October 2017, 01:10 AM   #18
eX Radikal is offline eX Radikal  Portugal
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Thanks for the answers.
#saabaab, I've thought of doing that. Not exactly with the potentiometer but just simple limiting the input. The potentiometer is a good and easy way anyway.

#doctormord, I tried to understand the first part with the calculations but got a bit lost. So, basically, they use 2 cells in parallel so they can supply 23.5w each. Each of this cell is still 3.7v, so, you are saying they boost to ~10V with a step up/booster?
I was about to buy one 12v lithium battery to use in my Project (probably using a tpa3116, still didn't bought it too). Do you recomend me to buy 18650 cells and a booster instead?

Also another question, is there any mini board/module that is adequated to use in projects like this to compress/limit/EQ the sound so it can sound "more sweet" (refering JBL Charge 2+, that I've listened to and love the sound, especially in low volume, they probably compensate the bass)?

Thank you so much for your attention
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Old 13th October 2017, 01:01 AM   #19
eX Radikal is offline eX Radikal  Portugal
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Well, let's discuss the battery system after the amplifier is choosen. I've selected a few boards from eBay, 5 3116's and 1 3118 only. Which one do you think is better (I can mod it after too, so consider that)? Do you recomend still another board (that isn't lots more expensive from this price range maybe)?

TPA3116:
1 - 1Pc TPA3116D2 2x50W Dual-Channel Stereo Audio Digital Amplifier AMP Board | eBay

2 - 50Wx2 TPA3116 D2 Dual Channel Digital Power Amplifier Board Stereo DC4.5-27V | eBay

3 - 2.0 HIFI 50W+50W TPA3116 D2 Audio Power Amplifier Digital Completed Board | eBay

4 - 2x100W TPA3116 D2 Dual Channel Digital Audio Amplifier Board 12V-24V for Arduino | eBay

5 - TPA3116 D2 120W+120W Dual-channel Stereo Digital Audio Power Amplifier 12V-24V | eBay

TPA3118:

6 - DC 12V-24V TPA3118 D Class Digital Audio Amplifier Board 30W*2 Power Amp Module | eBay

Thanks in advance,
eX Radikal

Last edited by eX Radikal; 13th October 2017 at 01:11 AM.
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Old 13th October 2017, 08:13 AM   #20
Yatsushiro is offline Yatsushiro  France
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Of the numerous 3116 boards I've used, the one above is one of the worst; very noisy with bad distortion. It improved slightly when I bypassed the volume pots.

Of the ones I have tried, these are my preferred boards:

Assembled TPA3116 class D amplifier board 50W+50W (green pcb) | eBay

New TPA3116 100W 12V-24V 3A Mono Digital Audio Power Amplifier Board BTL Out Amp | eBay
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