what's UCD?
I think I need something easy to build, and IC mosfet driver with a direct sound input (no discrete)
what's better, full or half bridge?
something loike 200W in 8R would be nice 🙂
I think I need something easy to build, and IC mosfet driver with a direct sound input (no discrete)
what's better, full or half bridge?
something loike 200W in 8R would be nice 🙂
Reference Design
I'm not sure there is a "reference design" for anything. By the time something becomes a "reference design" it is obsolete.
If you go to www.schematicsforfree.mattsoft.net make sure you click on the "File Index" link and not the individual folder links. I have been unable to upload a fix to the site for an as yet unknown reason.
In the audio circuits section, there is an area dedicated to Class-D amplifiers.
I'm not sure there is a "reference design" for anything. By the time something becomes a "reference design" it is obsolete.
If you go to www.schematicsforfree.mattsoft.net make sure you click on the "File Index" link and not the individual folder links. I have been unable to upload a fix to the site for an as yet unknown reason.
In the audio circuits section, there is an area dedicated to Class-D amplifiers.
schematicsforfree.mattsoft.net
The site is malfunctioning right now. Please try again in a few days.
The site is malfunctioning right now. Please try again in a few days.
tell me if I'm wrond, but from what I've understood (I've real all the threads from the search), UCD isn't a ready to use IC, but a topology (that no IC seems to use for now)
I'd like to build something simple, National's class d amp is nice. It uses one chip with an audio input, and a "mosfet" output. The second chip is a mosfet bridge.
I'm looking for something like that (but with more power). If the bridge is made of discrete mosfets that's no problem. I just don't want to have to deal with the integrator, the comparator, the feedback and such things
I'd like to build something simple, National's class d amp is nice. It uses one chip with an audio input, and a "mosfet" output. The second chip is a mosfet bridge.
I'm looking for something like that (but with more power). If the bridge is made of discrete mosfets that's no problem. I just don't want to have to deal with the integrator, the comparator, the feedback and such things
So why not ? There are working designs out there, you'd just have to pick one. One worked-out example is the one from the IR tutorial that was already mentioned above.
Regards
Charles
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
What does Bruno think about this ?
Regards
Charles
phase_accurate said:
do you remember the "something" ?
Jaka Racman said:
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
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
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
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".
Regards
Charles
Edit: This would give a nice "Switchclone".
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
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
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
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
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
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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