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Old 23rd November 2010, 01:10 PM   #1
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Angry Discontinued IC's

Hi guys,

I need you help. I was about to built my own class D amplifier with the LM4651 (and 52 ofcourse). -> LM46http://www.national.com/opf/LM/LM4651.html#Overview

The only problem is: I can't get my hands on those components since they are discontinued! Ofcourse it is easy to locate a class D amplifier IC, but i am looking for one that has 2 channels with 2x a full bridge output (about 10W or more) and an output stage that ISN'T integrated in the IC.

For some reason i keep finding ones that have the output-fets integrated .

I hope you guys can help me!

Regards,
Boudewijn

PS: Dont even think about the LX1720/1721/1722 since im not able to get them either (http://www.microsemi.com/micnotes/1501summary.pdf).
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Old 23rd November 2010, 01:35 PM   #2
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So you want an IC that has everything integrated (modulator/driver) except the FETs?

Have you considered the the IRS2092?
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Old 23rd November 2010, 03:27 PM   #3
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Thanks theAnonymous1,

But the IRS2092 doesn't have 2 channels (though that can be solved with 2 ic's) nor does it have a full bridge support
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Old 23rd November 2010, 03:50 PM   #4
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I think your options are extremely limited for such an IC.

There is also the ZXCD1000. You can buy a module with this IC from aliexpress.....

http://www.datasheetcatalog.org/data...s/zxcD1000.pdf

You can check this company for the LM4651/2.....

http://utsource.net/

I have bought parts from them in the past, so I know the site is legit.

The Tripath TC2000/TC2001/TCA2002 might be another option, but it needs an external FET driver.
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Old 23rd November 2010, 08:59 PM   #5
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Quote:
Originally Posted by theAnonymous1 View Post
So you want an IC that has everything integrated (modulator/driver) except the FETs?

Have you considered the the IRS2092?
The 2092 is a bit of a minefield for the faint of heart.

You need to pick the right mosfets for it with low gate capacitance.
I used irfb4019.

It is also very fussy about decoupling especially around the mosfets.
I missed off by accident the B+ to B- decoupling and the 2092 kept resetting.

If you use the datasheet for the 2092 then increase teh 10uf on vcc to 47uf or you might get glicthes on the vvcc rail which will keep resetting the 2092.

If you do get it working then it sounds very good, very wide bandwidth.

I cant speak for any other devices but my experience wasnt good when the datasheet circuit wouldnt work for me.

However it not working did give me a big insight into how the chip worked and the problems associated with class d, and a partial insight into SMPS too.
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Old 23rd November 2010, 09:03 PM   #6
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Look up irs2053, triple channel class d chip.
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