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Class D Switching Power Amplifiers and Power D/A conversion

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Old 21st July 2009, 07:01 AM   #11
berni8k is offline berni8k  Slovenia
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Yeah they are samples, they just released this chip recently so its hard to find in a store.

Oh and nice to see someone else from Slovenia here.
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Old 21st July 2009, 07:11 AM   #12
luka is offline luka  Slovenia
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hehe and we are not the only ones on here

I think I will like this IC, I can see it as car amp, hmm
Hope it will work out for you, maybe there will be something to look into later on
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Old 21st July 2009, 07:19 AM   #13
berni8k is offline berni8k  Slovenia
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If you can make a nice switch mode for it it would be a great car amp since it only needs a single supply 20-50V to work.

Oh and i looked trough your page and you made some nice amp and switchmode projects. It gave me a toght to build a switchmode my self. Right now i use a huge, heavy as hell toroid.
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Old 21st July 2009, 07:36 AM   #14
luka is offline luka  Slovenia
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Yea go for it, they are pretty simple, I had one for my first car amp, powering LM3886 @ +/-30v, that was cool and all, then I wanted something from Tripath [there were other amps, all AB], since this is PWM amp, so I got myself AMP2 from 41hz.com and made a bit too huge supply for it, so now I'm looking into getting AMP7 also

But this little IC, if it does what they say, it could be something use for highs in car [for normal users, whole set of front speakers]
Will see how this will turn out, so far I like it very much

As for you, yea try 12v smps, something small, say one from Risto80 on this forum, that was my first smps, working great and simple to study what is going on, what is important and what not so much
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Old 22nd July 2009, 07:25 AM   #15
berni8k is offline berni8k  Slovenia
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I assembled one channel of the amp and it dosen't work. Fist thing i found out was that i left the shutdown pin floating, fixed that and still wont make a sound now trying to find a solution
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Old 22nd July 2009, 07:26 AM   #16
berni8k is offline berni8k  Slovenia
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And the bottom
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Old 22nd July 2009, 07:38 AM   #17
luka is offline luka  Slovenia
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I don't know if it is ok for other outputs to float too
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Old 22nd July 2009, 10:05 AM   #18
berni8k is offline berni8k  Slovenia
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Oh misunderstood the shutdown pin its a output to indicate device is not in a error state and it is 0 meaning the device is shut down and dose not react to the reset signal.After some diging in the datasheet i found that the SD pin remains low no mater what when the device is preforming the so called PPSC (Pin to Pin Short Circuit protecion) and is Dependant on the output inductor... hmm the inductance of a open cirucit is something like infinite uH that means i have to wait infinite seconds for the amp to complete the procedure.... i dont think i have that much time.

Anyway this means i have to build the 2nd channel too.... damn where to find those bootstrap caps.
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Old 22nd July 2009, 11:01 AM   #19
luka is offline luka  Slovenia
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what kind are they? if smd is problem, then ok, but any cap will do
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Old 22nd July 2009, 11:29 AM   #20
Eva is offline Eva  Spain
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This PCB is missing a ground plane, don't expect it to work reliably in the higher supply voltage range.
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