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Old 27th October 2012, 11:20 AM   #1
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Default Class D Schematics

Hello my friends,

i am new here and wanted to know something about Class D Amplifiers.

Can anyone send/post me some Schematics, Circuits etc?

So I can understand it


Thanks
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Old 27th October 2012, 09:04 PM   #2
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Quote:
Originally Posted by Basti22 View Post
Hello my friends,

i am new here and wanted to know something about Class D Amplifiers.

Can anyone send/post me some Schematics, Circuits etc?

So I can understand it


Thanks
Look up the irs2092 datasheet.
There are also a number of application circuits varying in power and complexity.

Beware of layout and decoupling on the 2092, they are vital to getting a working pcb.
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Old 29th October 2012, 07:52 AM   #3
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Good morning, that's a good idea and I thank you.
But I am in search of circuit diagrams which are built discreetly.
This also gives you an idea?
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Old 29th October 2012, 09:12 AM   #4
bjaris is offline bjaris  Sweden
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have you seen this one?
http://www.nxp.com/documents/user_manual/UM10155.pdf
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Old 29th October 2012, 01:20 PM   #5
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Quote:
Originally Posted by Basti22 View Post
Hello my friends,

i am new here and wanted to know something about Class D Amplifiers.

Can anyone send/post me some Schematics, Circuits etc?

So I can understand it


Thanks

HI,Irs2092 is a single channel gate driver,very easy to be used,
if you have time.refer to my thread:
【DIY Project】120W x 3 Channel Class D Amplifier【Let's Make Class D easier 】

spend time to study step by step,i make sure you will be not just only a Diyer~~~
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Old 29th October 2012, 01:37 PM   #6
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Hey, yes I have see the Class D Amplifier from Phillips.

But I am looking for some other Stuff, without Finished moduls like gate driver etc.

I´m looking for a Discrete Class d Audio Amplifier.

You have some schematics?
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Old 29th October 2012, 02:15 PM   #7
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The UM10155 does not use finished modules like gate drivers etc.

Anyway - is there a specific reason, why you want to have it completely in discrete?
I also think, that there are sections of a class D amp, where a discrete solution can add value vs the common average integrated parts.
But the combined level shifters with gate drivers are not the field to gain much in discrete, IMHO.
(Except squeezing the last cents for a business plan. Especially smaller companies, which might not have enough purchasing power to get competitive pricing, could save some cents, if they have time and a strong engineering. But even with strong engineering it is not likely to compete or even outperform in terms of size, timing precision or the related tolerances during mass production).
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Old 29th October 2012, 02:26 PM   #8
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Quote:
Originally Posted by ChocoHolic View Post
The UM10155 does not use finished modules like gate drivers etc.

Anyway - is there a specific reason, why you want to have it completely in discrete?
I also think, that there are sections of a class D amp, where a discrete solution can add value vs the common average integrated parts.
But the combined level shifters with gate drivers are not the field to gain much in discrete, IMHO.
(Except squeezing the last cents for a business plan. Especially smaller companies, which might not have enough purchasing power to get competitive pricing, could save some cents, if they have time and a strong engineering. But even with strong engineering it is not likely to compete or even outperform in terms of size, timing precision or the related tolerances during mass production).
this suggest is very good~today the integrate amplifier has more advantage and Popular~
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Old 29th October 2012, 02:47 PM   #9
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I have built discrete and integrated class d circuits and the integrated one worked much better.
An irs2092 has built in protection which would take a lot of discrete circuitry.
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Old 6th April 2013, 04:56 PM   #10
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The UM10155 circuit does have that he advantage that it can be simulated easily. Once you have put together all the SPICE models and symbols, that is. You can then look at voltages and currents to your heart's content. With everything being discrete components it's all out there.

Here are a couple of pics of my efforts in LTspice. The waveforms shown are the output and the output MOSFET gate drive. Sorry about the lack of detail but I can't make the pictures any bigger!

If there is any interest, I can post all the files needed to make the simulation work.
Attached Images
File Type: jpg ClassD_discrete.jpg (137.1 KB, 313 views)
File Type: jpg ClassD_discrete_waves.jpg (340.2 KB, 300 views)
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