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Class D Switching Power Amplifiers and Power D/A conversion

My design L20D IRS2092+IRFI4020H  200W8R
My design L20D IRS2092+IRFI4020H  200W8R
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Old 7th November 2017, 02:42 PM   #1051
muca is offline muca
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Since you have to drive 4ohms, L30D board from aliexpress seller ZOE_TSANG. This seller ir recomended by author of these boards.
L30D/300 850W Mono Class D IRS2092 IRFB4227 IRAUDAMP9 Amplifier completed board by LJM-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group
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Old 28th November 2017, 08:26 PM   #1052
yoke is online now yoke  Croatia
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Thanks Muca (I haven't recive notification about you replay via email...so I'm little slow on replay )
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Old 30th November 2017, 02:53 PM   #1053
Sma1033 is offline Sma1033
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I am curious about the gate driver linear regulator you use on board.

the linear regulator transistor for IRS2092 gate driver usually generates lots of heat.

why don't you use switching regulator instead ?

a 80v buck IC + LM317 combination should do the job fairly well.
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Old 12th January 2018, 10:17 PM   #1054
Baphoment is offline Baphoment
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Quote:
Originally Posted by aquataur View Post
Hmm. Although this is within the marks, you probably are pushing the envelope with that high a supply.

Moderate volume is probably not much power-wise, since you can produce 90dB with one watt on a moderate speaker. So it canīt be the power.

Those modules produce power for the controller directly from the rails with dropper resistors which inevitably dissipates power. This is probably what you encounter as standby loss. Some slightly more elaborate scheme (albeit inevitably more pricey...) would cater for this.

-h
I exchanged my Transformer with a 65V switching PSU board. The Bords are much cooler now. I haven't expected such an impact on the heat dissapation, cause the Board is rated up to 80V. Seems like the 80V is a limited time surival limit and the recommanded 70V shouldn't be exeeded.
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Old 30th April 2018, 09:05 AM   #1055
Mayday is offline Mayday  Sweden
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My design L20D IRS2092+IRFI4020H  200W8R
I've got two of the L20D boards on the way along with a 500W ~ +/-73Vdc SMPS. I write ~ as the SMPS is good for 110-240VAC, the stated output of +/-70Vdc is with a 220Vac mains where as I have 230Vac mains.
My question has to do with power supply capacitors, as I understand it, SMPS supplies aren't to fond of big capacitors? (Between the supply and the amp modules)
Those of you who use SMPS supplies with these boards, how have you done?
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Old 30th April 2018, 09:34 AM   #1056
serafis is offline serafis  New Zealand
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My amp design (see my gallery) uses seven L15D 150W modules running off two +/-55V SMPS PSUs. I replaced the two buffer electrolytic caps on each of the L15D boards with Rubycon 820uF 63V caps (for improved bass), but haven't added any other caps between the supply and the modules, and have had no issues whatsoever. Sounds fantastic at any volume.

So I'm not sure that any additional caps are necessary. However, you might want to consider using a phase inverter on the input one of the channels (and reversing the corresponding speaker polarity) to avoid any possibility of bus pumping at low frequencies, which can be an issue with class D amps. Slides 13-15 in my gallery show the schematic, board layout and connections for the phase inverters I built.
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Old 30th April 2018, 10:11 AM   #1057
Mayday is offline Mayday  Sweden
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My design L20D IRS2092+IRFI4020H  200W8R
Would it be better to use one smps for each amp module?
Ie full dual mono?
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Old 30th April 2018, 10:30 AM   #1058
Mayday is offline Mayday  Sweden
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My design L20D IRS2092+IRFI4020H  200W8R
Is the phase inverter needed two L20D fed by one smps?
Has anyone experienced bus pumping with these amp modules?
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Old 30th April 2018, 10:45 PM   #1059
serafis is offline serafis  New Zealand
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Quote:
Would it be better to use one smps for each amp module?
Ie full dual mono?
I think that would be overkill, and each amp could still cause some bus pumping on its PSU.

Quote:
Is the phase inverter needed two L20D fed by one smps?
Has anyone experienced bus pumping with these amp modules?
Phase inversion on one channel in a stereo configuration is recommended in the IRAUDAMP7 Reference Design, and is actually included in that design for a single stereo half-bridge / mono full bridge switchable board. That's why I included phase inverters in my design, and also slightly increased the bus capacitors. Bus pumping is described on P26 of the IRAUDAMP7 Reference Design, and the inverter schematic is shown on P27 and P32.

Having said all that, I don't actually know how big a problem bus pumping is at normal listening volumes - it would certainly be worse in a subwoofer application, as it is happens at low frequency, high output. Someone else might have a view on this.

Perhaps you could try it first without a phase inverter, but measure the + and - voltages across the the PSU at all listening levels and for a reasonable time period (I use cheap 100W 8 ohm resistors from Aliexpress instead of speakers for testing, to save my ears and keep peace with the family and the neighbours!), and if either bus voltage starts to rise then you could add a phase inverter to one channel later.

By the way, two other modifications I made were:
  1. to replace the resistor that controls switching frequency with a multi-turn trimpot so I could adjust the switching frequencies on each channel to less than 5Hz of each other, to avoid interference between channels (see reference Design P21-22), and
  2. to replace all the 22uF electrolytic caps with Elna Silmic II caps, as these are said to give a smoother sound.

I wanted to get the best possible sound from these amps, so I thought it was worth the extra time and trouble follow the reference design recommendations, and for these other mods. And I am blown away by the smooth and effortless sound quality, as are my somewhat critical friends who were doubtful that a home-built class-D amplifier could sound this good!

Good luck with your build.
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Old 4th May 2018, 09:26 AM   #1060
Mayday is offline Mayday  Sweden
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My design L20D IRS2092+IRFI4020H  200W8R
I ordered a 500VA 2x48Vac transformer from toroidy, the potted audio labeled kind.
I figured I may use it for this build, or if I'm happy with the switch mode power supply, I'm sure there are other amp projects that I can use it for down the road.
Not sure if it, and PS capacitors, will fit the enclosure I have on the way for the L20D build.
enclosure
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