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Class D Switching Power Amplifiers and Power D/A conversion

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Old 27th June 2012, 11:31 AM   #1
Lumi71 is offline Lumi71  Germany
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hi,
does anyone have experience with these boards?

Assembled IRAUD350 mono Power amplifier board Class D AMP board | eBay



seems to be very interesting. especially for me as i have no experience in diy amps and these boards seem to have power supply and speaker protection included.
how do they compare to other irs2092 boards, like l15-l25d?


as i am no expert. does one board need 2x20-2x58v?
so i would need one transformer for each mono board?
or could i use one transformer for two mono boards, building a stereo amp?

am i right in thinking that do this board can be stable to drive 2 ohm for the less of power (i really would be satisfied with half of the output power). so i should use transformer with about 25-30 volt?

thanks
stefan
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Old 27th June 2012, 01:06 PM   #2
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one problem, 2092 amp frequency change wide range with different loader, anyone here have good solutions to avoid this and get good EMI performance ? how to decrease radio interference?
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Old 27th June 2012, 01:11 PM   #3
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Default IRAUD350 Class D amplifier

Stefan,
This looks beautiful - I am trying to find the spec for this amplifier.
Regards,
Stephan
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Old 27th June 2012, 03:59 PM   #4
Lumi71 is offline Lumi71  Germany
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as i am really a newbie in building amps i had a look at some formulas. so i think i learne a few things. maybe one could confirm, or not if i am wrong of course

sorry if i am not talking with the right technical terms

1. i can "set" the min. load impedance by looking at the max. output power the amp can do before "melting" and decrease the input voltage.

watt=ampere x volt

so in this case 700 watt at 2x58 ac at 4ohm load. regarding that wattage is fixed and ampere will increase with for example 2 ohm load, i have to lower input voltage to 2x29 ac right?

2. output voltage of the transformer will not change equal how many amp boards i connect. right?
so i could connect two boards to one transformer with 2x29 ac.

3.i will have to look at the max watt(=va) of the transformer if i connect to boards to one transformer. right?
so in my case the transformer should have 1400 va (watt) which would mean about 25 ampere at 2x29 volt ac. or is the va /wattage a product of ampere and dc volt?


so all in all if it seems i have to find a transformer with not too much voltage but much many ampere...., right?

apart from that could be a problem, i think this board could be a good solution for a powerful yet stable class d amp...

the amp in the example should have:

175 Watt/8 ohm
350 Watt 4 Ohm
700 Watt 2 Ohm
all at 0,1% THD...

if i am right....




let me know if i am wrong in the points above. as i said i never build an amp before and concerning about these themes just for a few days....

thanks
stefan
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Old 27th June 2012, 08:42 PM   #5
Lumi71 is offline Lumi71  Germany
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wrong link.....sorry . this is the right board:
YJ New 700W 4ohm Mono IRAUD350 IRS2092 IRFB23N15D+speak | eBay
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Old 29th June 2012, 08:46 AM   #6
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IRFB23N15D are 150V fets. 2x58V AC means about 2x80V DC, so total 160V.
Can it take? Maybe for a while...
The wattage ratings are also overrated. See IR's refrerence design. For 150V FETs IR reccomends max 2x60V DC supply (bus pumping, overshoots etc...) and states about 125W to 8 Ohm and 250W to 4 Ohm (half bridge like these amps) undistorted.
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Old 20th October 2012, 07:07 AM   #7
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I just had to register to correct that last comment for anyone else who might come by this thread on google, remember theres one MOSFET for positive and another for negative so you dont add + and - together, one MOSFET gets the positive work and the other gets the negative work.
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Old 20th October 2012, 07:38 AM   #8
luka is offline luka  Slovenia
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Quote:
Originally Posted by lorylaci View Post
IRFB23N15D are 150V fets. 2x58V AC means about 2x80V DC, so total 160V.
Can it take? Maybe for a while...
The wattage ratings are also overrated. See IR's refrerence design. For 150V FETs IR reccomends max 2x60V DC supply (bus pumping, overshoots etc...) and states about 125W to 8 Ohm and 250W to 4 Ohm (half bridge like these amps) undistorted.
not AC but DC, 58 Vdc... and this is 700w peak into 4, so lets say 350Wrms into 4R
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Old 20th October 2012, 08:26 AM   #9
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Oops I was wrong.
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Old 4th April 2013, 08:17 AM   #10
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So what's people's opinions of this board, I'm looking for something like this to drive a 15" woofer as part of my setup, it's to run along side two active 10" mid bass and two horn tweeters so I can take a bit of the bass of the tens and run them slightly higher. Any thoughts?
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