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-   -   Philips UCD application note (http://www.diyaudio.com/forums/class-d/85389-philips-ucd-application-note.html)

Steven 26th August 2006 01:46 PM

Philips UCD application note
 
2 Attachment(s)
Philips released its UCD application note.

http://www.semiconductors.philips.co.../UM10155_1.pdf

The UcD concept was patented by Philips. However, the use of the IP is granted (without a license fee) to third parties that use the enabling semiconductor components from Philips Semiconductors in their application.

IVX 26th August 2006 02:21 PM

Fig 1.General view -"Philips *** D amp ".. Funny, but If Philips would be my own, I would dismiss the photographer! :cool:

djQUAN 26th August 2006 03:02 PM

a good starting point for a DIY class D amp..... just printed it and gonna have a read.......

classd4sure 26th August 2006 04:25 PM

>120dB SNR?? ... and with this single ended version? hmmmmmm.

It's an OK read, but you'll learn more from going to the hypex website and reading an actual paper written on it by the guy who actually knows something of it, and much more yet from the posts on this forum if you go back far enough.

Did they give the "most important" information or the most basic? According to Bruno's comment the last time this was brought up.... this is all they've got to give on it. Funny. I guess that explains them having "serious problems implementing it" (so a little bird told me)... guess they should have stayed on his good side?

Funniest part:

"Again, any changes are left the responsibility of the experimenter, but assistance from
Philips will be available through the local sales representatives."

What part of that do you think gets removed upon the next revision of the datasheet.

Ivan, about the pic.. it's your typical microfilm quality, they must have stolen it when he had his back turned :D

djQUAN 26th August 2006 04:36 PM

I've done some looking around in it and didn't find anything about input sensitivity or gain......

although the simple schematic appeals to me..:D

classd4sure 26th August 2006 04:40 PM

Well, there's alot of reading you can do in the areas I mentioned, but if you really want to get your feet wet and jump in head first, just build this sucker and use as advised. I wouldnt' expect that performance from it though.

This cheapness is likely to be the reason why Philips can't make use of it! So if you want better... you're going to have to dig up a little more on it, but it's all out there.

EDit: You're not going to want to judge a Hypex version based on this sucker though!

djQUAN 26th August 2006 04:43 PM

well, I'm not really looking for the "best class D that money could buy" thing but something quick and dirty to drive a pair of subs. probably build this first as is and work up to a higher power version when I get a feel of things.

edit also:if you got a link for a schematic with more power and better performance as is then I'm all ears (or eyes.:D )

fokker 27th August 2006 02:29 PM

that's an interesting link. appreciate it.

i am still struggling with mine - which more and more looks like a mosfet driver issue but I will report back when I get it fixed.

classd4sure, what is the "most important" information? I think a good circuit is one that is first of all robust. If something is that quirky, there usually is something foundamentally wrong with the circuit.

classd4sure 28th August 2006 09:18 AM

Quote:

Originally posted by fokker
that's an interesting link. appreciate it.

i am still struggling with mine - which more and more looks like a mosfet driver issue but I will report back when I get it fixed.

classd4sure, what is the "most important" information? I think a good circuit is one that is first of all robust. If something is that quirky, there usually is something foundamentally wrong with the circuit.


I don't know I tend to think alot is equally important oppositly than they've pointed out. You don't have to worry about it though, because all that stuff doesn't appear in their version of it :)

You're using a driver IC right? Maybe post some experiences/schematics to your thread and we can help you out with whatever issues?

Cheers,
Chris

jan.didden 28th August 2006 09:29 AM

Well, a lot of comments I see here are of the variety "it's simple, therefore it can't be good". Does anybody actually understand how it works?

Jan Didden


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