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Old 28th January 2011, 04:46 PM   #1
riktw is offline riktw  Netherlands
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Default TDA8954 output filter

Hello

i am busy with a TDA8954 PCB.
the TDA8954 looks like a fairly easy IC for a high power amplifier.
PCB design should work out, PCB will be professionally made in china (so cheap )
but one thing bothers me, the output filter, especially the inductors.
i can imagine these should be able to withstand some serious currents.
i want to make a stereo amplifier for 4 ohm speakers, so roughly 200 watts per channel.
but a classmate wants to make a BTL version of it (8 ohm 400 watts)
what coils are good for this kind of currents?

when looking trough the coilcraft site i found two types look promising:
Coilcraft PCV-1 Vertical Mount Power Chokes
Coilcraft VER2923 High Current Power Inductors

would one of those types be good enough to handle high currents and have decent audio performance?

datasheet TDA8954:
http://www.nxp.com/documents/data_sheet/TDA8954.pdf

Rik
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Old 28th January 2011, 08:20 PM   #2
beun is offline beun  United States
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The VER2923 looks like a good candidate with a nice flat inductance versus current curve, seems shielded too. I didn't see a place where you can buy them though.
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Old 28th January 2011, 08:34 PM   #3
riktw is offline riktw  Netherlands
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i kind of sampled 4 to try them hehe
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Old 29th January 2011, 12:42 AM   #4
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The main problem I have found with class d output inductors is some of them cook far too easily.

I bought a selection and used the best one from then on.
One of the poor ones ran at 180 degrees C !
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