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Class D Switching Power Amplifiers and Power D/A conversion

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Old 25th June 2004, 08:21 AM   #31
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Quote:
Originally posted by phase_accurate


So why not ?

because I want something simple. Like a class d chim amp
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Old 25th June 2004, 09:09 AM   #32
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There's a new chip by philips (TDA.... something), that contains comparator, drivers and powerstage. With this one it should be possible to build a minimalistic UCD maybe.
What does Bruno think about this ?

Regards

Charles
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Old 25th June 2004, 09:15 AM   #33
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Quote:
because I want something simple. Like a class d chim amp
Hi,

then your best bet would be something like that. You get real McCoy UcD for 60 Euro IIRC.

Best regards,

Jaka Racman
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Old 25th June 2004, 09:29 AM   #34
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Quote:
Originally posted by phase_accurate
There's a new chip by philips (TDA.... something), that contains comparator, drivers and powerstage. With this one it should be possible to build a minimalistic UCD maybe.
What does Bruno think about this ?

Regards

Charles
do you remember the "something" ?


Quote:
Originally posted by Jaka Racman

Hi,

then your best bet would be something like that. You get real McCoy UcD for 60 Euro IIRC.

Best regards,

Jaka Racman
I'm looking for something quick n cheap. 60 (+S&H) *2, plus transformer, plus caps, plus filter....





I'm now seriously thinking about usung National's chip, even if it's not as powerful as I would like. For the momment that's the closer I found, from quick n cheap
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Old 25th June 2004, 09:56 AM   #35
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Hi,

if there was a "cheap, quick and dirty" way of doing class D, you would see more of it. Here is the link for TDA... , but you would need to do PCB for it. I will not say that P2P approach is not possible, but you would have to know exactly what are you doing, which are the loops that must be keep tight, how to implement proper grounding, etc. You will also learn that switching circuits have a very fragile barrier for Magic Smoke which is enchanted into components during manufacture to make them work. IMHO 60 Euro is cheap for ready made module, which is guaranted to work. Power supply costs will be the same whatever path you take.

Best regards,

Jaka Racman
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Old 25th June 2004, 10:23 AM   #36
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Yes that is the "something" I meant. In the meantime they even have a better datasheet online. But there is still no data about availability, pricing etc.

Regards

Charles

Edit: This would give a nice "Switchclone".
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Old 25th June 2004, 10:35 AM   #37
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Thanks for the link,

If I understood the datasheet correctly, I need another chip to drive the TDA8939 (a PWM controller), right? So I can't directly feed the inputs with an audio signal
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Old 25th June 2004, 11:02 AM   #38
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Hi,

I think you should read Bruno's comments on the chip in the UcD Mueta thread. Maybe it would be possible to use both halves paralelled in dual supply configuration and make UcD type amplifier with built in comparator. Another approach would be to use single supply and one of the TI small filterless class D chips as modulator and TDA as power output stage.

Best regards,

Jaka Racman
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Old 25th June 2004, 11:08 AM   #39
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Because this thingie

1) can be used with symmetrical PSU and

2) has a built-in comparator

it should be possible to make something like an UcD.

Regards

Charles
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Old 25th June 2004, 11:34 AM   #40
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There seem to be lots of duscussion about UcD
Hasn't anything be built yet? I saw some redults (distortion measurements...) but no photo/schematic or pcb.
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