TDA8954 output filter

riktw · 28th January 2011, 04:46 PM

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

beun · 28th January 2011, 08:20 PM

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.

riktw · 28th January 2011, 08:34 PM

i kind of sampled 4 to try them hehe

nigelwright7557 · 29th January 2011, 12:42 AM

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 !

28th January 2011, 04:46 PM	#1
riktw diyAudio Member Join Date: Sep 2007	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

29th January 2011, 12:42 AM	#4
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	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 ! __________________ http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software.

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28th January 2011, 08:20 PM	#2
beun diyAudio Member Join Date: Feb 2010	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.

28th January 2011, 08:34 PM	#3
riktw diyAudio Member Join Date: Sep 2007	i kind of sampled 4 to try them hehe

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