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Class D Switching Power Amplifiers and Power D/A conversion

800w rms 4ohm d class suggestion
800w rms 4ohm d class suggestion
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Old 8th February 2019, 02:40 PM   #1
Mordor is offline Mordor  Italy
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Join Date: Jun 2004
Location: Venice
Default 800w rms 4ohm d class suggestion

Hi, any suggestion about 800w rms class d amplifier schematic to build for a subwoofer 4ohm?
I have a trasformer 55 0 55 AC (77 0 77 DC) 1000VA to use, searching for a stable solution for PA sub... any ideas or schematic?
Thank you
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Old 10th February 2019, 05:57 PM   #2
chermann is offline chermann  Austria
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Join Date: Jan 2017
Location: Vienna
Quote:
Originally Posted by Mordor View Post
Hi, any suggestion about 800w rms class d amplifier schematic to build for a subwoofer 4ohm?
I have a trasformer 55 0 55 AC (77 0 77 DC) 1000VA to use, searching for a stable solution for PA sub... any ideas or schematic?
Thank you

schematics not...i am not a developer....



but TPA3255 EVM by TI or mono board by 3e audio will come close to your 800W
or cheaper but about 500W

IRS2092
Fixing [and preventing] a fried Zobel network
Ebay amp - is 500W believable?


chris
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Old 10th February 2019, 07:25 PM   #3
FauxFrench is online now FauxFrench  France
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Location: The mountains, calm and quiet.
As you have a transformer for a symmetrical power supply, my first idea would be an IRS2092 based amplifier. Such as suggested by Chris. IRS2092 can handle high (symmetrical) switch voltages and as the power switches are external of the IC, the power switches can be chosen to handle large currents.
Nigel is very experienced with IRS2092.

+/-77Vdc, if not sagging when loaded, should allow some 650W-700W power in 4 Ohm with SE operation. BTL operation is an option but then the supply voltage is on the high side. Does it have to be 800W or rather use of that transformer?

For the schematics, the datasheet is always a starting point.
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Old 11th February 2019, 10:03 AM   #4
Mordor is offline Mordor  Italy
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Join Date: Jun 2004
Location: Venice
Ok, thank you, is a nice start.
I have an RCF speaker (15" 850wrms 4ohm) and a trasformer from scratch (1000VA 55 0 55), so idea was to not left it in the dust and make a simple reflex sub for live PA application in small pub.
Trasformers is very heavy and tall, but... inside the sub box is ok.... impossible to make a rack PA.
Im able to make PCB, is my second job, so i can buy kit or think to build it.
Bridge could be an option ... but 4 ohm and 77v + 77v arent so good maybe.
SE could be ok, taking out till last watt in order to obtain 700 w rms
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Old 11th February 2019, 03:14 PM   #5
chermann is offline chermann  Austria
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normaly pub are nice and small...you really need 800WAtt
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Old 11th February 2019, 03:20 PM   #6
Mordor is offline Mordor  Italy
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Join Date: Jun 2004
Location: Venice
We havent same concept about pubs... isnt like uk
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