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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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Join Date: Sep 2013
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 offline 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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Join Date: Apr 2017
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.

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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