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Volt+ tpa3118 testing data
Volt+ tpa3118 testing data
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Old 15th March 2017, 10:50 AM   #1
cdsgames is offline cdsgames  Canada
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Default Volt+ tpa3118 testing data

Hello,

the first testing of the Volt+ at 1W with 4 Ohm

5W , 15W to fallow.
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File Type: pdf VOLT+ - 1W.pdf (529.2 KB, 203 views)
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Old 16th March 2017, 08:53 AM   #2
cdsgames is offline cdsgames  Canada
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5W and 10W testing . Compared with datasheet of TI we have better specs on THD+N

Please comment , doctormord what do you think.
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File Type: pdf 10W.pdf (529.9 KB, 61 views)
File Type: pdf 5W.pdf (531.0 KB, 28 views)
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Old 16th March 2017, 10:42 AM   #3
cdsgames is offline cdsgames  Canada
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Last one 15W
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File Type: pdf 15W.pdf (528.4 KB, 80 views)
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Old 16th March 2017, 11:47 AM   #4
irribeo is offline irribeo  Netherlands
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Yes these look good to me now, very good.
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Old 16th March 2017, 12:17 PM   #5
cdsgames is offline cdsgames  Canada
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Thx you irribeo I appreciate it.
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Old 17th March 2017, 09:06 AM   #6
alkasar is offline alkasar  France
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quick look and yep, THD+N looks much better than usual TPA3118 boards. Measures as good as EVM

The first measurement @1W is in 4ohm and the others in 8 ohm. Not a problem, just good to mention.

If I read correctly, the gain is 20dB. What was the power supply voltage during these tests ?
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Old 17th March 2017, 09:30 AM   #7
cdsgames is offline cdsgames  Canada
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Yes we measured first at 4ohm but there is not much diff at 8ohm. We used our own SMPS at 19v better than most SMPS but still some noise on it.

Yes gain is lowest 20db and yes I think we reach (and few cases exceed) the EVM.

I hope the measurements show that our Volt+ is a well designed TPA3118.
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Old 17th March 2017, 09:54 AM   #8
irribeo is offline irribeo  Netherlands
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regarding the 4 ohm measurements: why does overdamped outputfilter show slightly rising frequency respons

32xx evm with coilcraft mss inductor (similar construction) might perform worse than what these data show. 31xx evm datasheet graphs use less feedback/26dB gain. On all 31xx ampboards lower gainsetting is an audible difference (outputlevels matched) especially when outputlevels increase.
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Old 17th March 2017, 10:38 AM   #9
alkasar is offline alkasar  France
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Quote:
Originally Posted by irribeo View Post
regarding the 4 ohm measurements: why does overdamped outputfilter show slightly rising frequency respons
rise also present on the 8ohm measurements.
+1dB at 20kHz is not a big deal. It seems to indicate that the output filter has an overshoot.

Is the detailed schematic with component values availbale ?
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Old 17th March 2017, 11:58 AM   #10
irribeo is offline irribeo  Netherlands
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4 ohm respons is surprising to me, not the 8 ohm respons
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