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Volt+ tpa3118 testing data
Volt+ tpa3118 testing data
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Old 18th March 2017, 12:48 PM   #21
cdsgames is offline cdsgames  Canada
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Quote:
Originally Posted by doctormord View Post
If i look closely, i see that you measurements are done at 20dB gain while all datasheet plots are for 26dB. So it's not comparable.
Why do I get the feeling that no matter what we make public ,you will always find a problem with it.

We published the data , its clear that Volt+ is one of the best TPA3118 implementation .

You could graciously admit so..
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Old 18th March 2017, 01:32 PM   #22
irribeo is offline irribeo  Netherlands
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Visually what is surprising to me.
A TI published 4 ohm frequency respons for 684J filmcapacitor/7uH inductor and equal snubbervalues, with in orange the volt+ latest shown respons and in red the location I would expect it to be.
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File Type: png volt.png (68.9 KB, 224 views)
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Old 18th March 2017, 04:07 PM   #23
doctormord is offline doctormord  Germany
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Quote:
Originally Posted by cdsgames View Post
Why do I get the feeling that no matter what we make public ,you will always find a problem with it.
Because there's always a systematic mistake with the stuff you publish.
The first measurements you posted where absolutely nonsense, and no-one at your team checked that before publishing them.
You compare your measurements to the EVM data but do your measurements at a different gain level. You simply can't compare this data directly.

If your board has better performance than the EVM, kudos to you and your team.

Getting kudos simply needs a minimum level of scientific work or proper engineering.

But you still didn't proved.

This all isn't mean in any personal offending matter.

Edit:

One thing really makes me wonder. From your measurements the Volt+ has decreasing THD+N with increasing output-power, how does this work?

Last edited by doctormord; 18th March 2017 at 04:19 PM.
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Old 18th March 2017, 04:35 PM   #24
alkasar is offline alkasar  France
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waow, that's aggressive comments...

Quote:
Originally Posted by doctormord View Post
One thing really makes me wonder. From your measurements the Volt+ has decreasing THD+N with increasing output-power, how does this work?
???

Click the image to open in full size.
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Old 18th March 2017, 05:22 PM   #25
doctormord is offline doctormord  Germany
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I don't see any aggression in my comment from a German point of view.

One thing to note:

It seems that the channels where swapped for the 5W and 15W measurement, as they measure worse on the other measurements.

1W: Ch2 worse
5W: Ch2 better
10W: Ch2 worse
15W: Ch2 better

Anyway i'll compile some data to see the performance more clear.

Last edited by doctormord; 18th March 2017 at 05:40 PM.
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Old 18th March 2017, 06:28 PM   #26
doctormord is offline doctormord  Germany
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Here we are.

Volt+ tpa3118 testing data-thd_vs_f_19v_4r_20db-png

Volt+ tpa3118 testing data-thd_vs_pout_19v_4r_20db-png
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File Type: png THD_vs_F_19V_4R_20dB.png (17.2 KB, 230 views)
File Type: png THD_vs_Pout_19V_4R_20dB.png (12.2 KB, 227 views)

Last edited by doctormord; 18th March 2017 at 06:35 PM.
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Old 18th March 2017, 07:23 PM   #27
irribeo is offline irribeo  Netherlands
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I think 1 watt was only 4 ohm data shown, others lately were 8 ohm.
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Old 18th March 2017, 07:35 PM   #28
doctormord is offline doctormord  Germany
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Yeez..

But shouldn't change much.

Last edited by doctormord; 18th March 2017 at 07:39 PM.
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Old 18th March 2017, 07:47 PM   #29
cdsgames is offline cdsgames  Canada
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Quote:
Originally Posted by doctormord View Post
Because there's always a systematic mistake with the stuff you publish.
The first measurements you posted where absolutely nonsense, and no-one at your team checked that before publishing them.
You compare your measurements to the EVM data but do your measurements at a different gain level. You simply can't compare this data directly.

If your board has better performance than the EVM, kudos to you and your team.

Getting kudos simply needs a minimum level of scientific work or proper engineering.

But you still didn't proved.

This all isn't mean in any personal offending matter.

Edit:

One thing really makes me wonder. From your measurements the Volt+ has decreasing THD+N with increasing output-power, how does this work?
Yes , the first data I published was sent from testing team and I publish it without checking. I simply posted the data
Second yes you are right you cannot compare , but you could admit its a good implementation .. thats all that I have been asking.
Third you say that its "strange" to see that THD+N is increasing with W ...ok lets check a bit from engineering point of view.
1W highest THD. Could that be explained by the fast that we used 4ohm termination instead of 8ohm as we designed the filter ?
15W---second highest Ok that checks
10W-5W data is very close but under the 15W.
Higher levels THD+N On 5W the higest (0.015) and on 10W is 0.02 (so it checks)
Lower levels THD+N : Could it be that at levels of 0.007 vs 0.0055 anything matters including RF, temperature skews , common mode noise ??

I am not offended by your comments drmord and I understand that from your German point of view you have no aggression.

Take this from an Canadian point of view (mine) . You look at our data with negative mindset and try to see problems , like above , where there are none .
You seem like a brilliant engineer and give a lot back to community and this is something that I respect about you.

What I cannot respect is you , not accepting the fact that our proud Indian team has come out with a "cheap" tpa 3118 with (very) good specs and you are unable to say so..

Do you have a graph for that ?
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Old 18th March 2017, 08:44 PM   #30
doctormord is offline doctormord  Germany
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I compared/measured some more data with other 3118 implementations, so far Volt+ is clearly winning for output power > 2W.

For the fact of having a "negative mindset", well yes, i'm "oversceptical" by nature.

Cheers.
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