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Class D Switching Power Amplifiers and Power D/A conversion

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Old 10th April 2007, 07:24 AM   #1
Rodo is offline Rodo  Argentina
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Thumbs up TDA8920B - Design Partners Wanted

Hi. Iīm testing last version of TDA8920: TDA8920B. PCB is not in datasheet so Iīm starting from begining. Iīm making a versatile PCB but I need some assistance with schematics and lay-out issues. I plan to use 2 TDA8920B in BTL mode but also with 4 x SE ouputs. Imputs will be selected whith jumpers. Also all design will be modular.
I have experience with PCBs development.
If somebody wants to work with me in project is wellcome. I use Protel but I can share any format output (.pcbs, gerber files, png, corel, etc.). Post is opened.
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Old 10th April 2007, 08:48 AM   #2
Ipanema is offline Ipanema  Malaysia
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There's lots of crosstalk between the channel when I tested the evalution board. Maybe you should consider only use it in BTL mode.
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Old 10th April 2007, 10:53 AM   #3
fumac is offline fumac  China
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hi Rodo

i had make 8920B

use 2 TDA8920BTH in BTL mode but also with 4 x SE ouputs

IS JUST LIKE ME

http://www.class-d.net/UploadFiles/200719205623223.jpg
this is the PIC

RG
FUMAC
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Old 10th April 2007, 04:49 PM   #4
Rodo is offline Rodo  Argentina
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Quote:
Originally posted by Ipanema
There's lots of crosstalk between the channel when I tested the evalution board. Maybe you should consider only use it in BTL mode.
Hi Ipanema.
Datasheet specification for channel separation is about 70 dB. Only reference I found in both datasheets (8920 and 8920B) about advantage of using BTL is because pumping effect in supply.
Did you tested 8920B with evaluation board PCB in datasheet for 8920 or you made a new lay-out?
Schematic for 8920B has some changes in components and supply. Could it be reason for crosstalk?
I have not tested any of both so I have not idea.
Reason to use SE as BTL is because I have some Hifi speakers with low RMS power limit (about 35 W 8Ohms). Also I plan to use BTL for SB and any other configuration I could test with more powerful speakers.
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Old 10th April 2007, 04:57 PM   #5
BWRX is offline BWRX  United States
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Quote:
Originally posted by Rodo
Datasheet specification for channel separation is about 70 dB.
At what frequency?
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Old 10th April 2007, 05:00 PM   #6
Rodo is offline Rodo  Argentina
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Quote:
Originally posted by fumac
hi Rodo

i had make 8920B

use 2 TDA8920BTH in BTL mode but also with 4 x SE ouputs

IS JUST LIKE ME

RG
FUMAC

Hi fumac.
I followed some posts you made for PCBs for hi frequencies considerations and I learned a lot! Also I surfed your site and amplifiers you made are amazing! You could make a lot of money with UPS and swithching power supply boards because hi frecuencies for that devices are very dificult to use.
Returning to amplifiers: I will try some easier one.
I found 8920B very interesting for beginers.
Did you have any problem with crosstal in SE configuration?
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Old 10th April 2007, 05:06 PM   #7
Rodo is offline Rodo  Argentina
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Quote:
Originally posted by BWRX


At what frequency?
Hi BWRX.
Thanks for you post.
1W / 0 Ohms / 1kHz.
But have in mind for class AB hybrid amplifiers, testing parameters are more than enough.
Do you think for class D channel separation varies more than AB amplifiers with frequency?
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Old 10th April 2007, 05:47 PM   #8
fumac is offline fumac  China
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rodo

when i was a beginer(even this day ,i am newb )
i tryto design class-d for my project a wireless speaker
i'm start at 8920
but it's not very easy to dowith it

inside the chip, low signal and high power mixer
so must to attention to the decoupling

i design 3 versions pcb, then make 8920 ok
after that, i found the chip of class-d is not good at high power
so changto other way

good luck

rg
fumac
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Old 10th April 2007, 06:14 PM   #9
Rodo is offline Rodo  Argentina
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Quote:
Originally posted by fumac
rodo

inside the chip, low signal and high power mixer
so must to attention to the decoupling

i design 3 versions pcb, then make 8920 ok
after that, i found the chip of class-d is not good at high power
so changto other way

good luck

rg
fumac
Hi again fumac.
Do you think a chipset solution is better way? It means using a chip to PMM and other for power output?
I donīt need hi output power. 80+80 W is enogh for me but I donīt want to use a huge heatsink.
I couldnīt find other chips to use with easy board lay-out.
Idea is to use double side boards but without metalized holes using top layer for ground plane.

Trypath has some different options than 8920 but I canīt get chips in Argentina.
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Old 11th April 2007, 01:40 AM   #10
fumac is offline fumac  China
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Quote:
Originally posted by Rodo


Hi again fumac.
Do you think a chipset solution is better way? It means using a chip to PMM and other for power output?
I donīt need hi output power. 80+80 W is enogh for me but I donīt want to use a huge heatsink.
I couldnīt find other chips to use with easy board lay-out.
Idea is to use double side boards but without metalized holes using top layer for ground plane.

Trypath has some different options than 8920 but I canīt get chips in Argentina.
i have tested 8920 and class-t(100w@4r) in same speakers(tannoy), personal chiose 8920, the bass of 8920 is better than the class-t, the treb of class-t is better than the 8920.
no one is better than other one in all test. so i delete all of them in my new projects.

about chip set

i did not find any chipset is good Enough at class-d ,(i just read the pdf of them,no interest to test them again),

rg
fumac
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