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 Class D Switching Power Amplifiers and Power D/A conversion

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stewin
diyAudio Member

Join Date: Jul 2007
Quote:
 Originally Posted by manojtm Hi stewin, for class d filter use ETD29 core with 1mm air gap( supply +75v -75v) Regards MANOJ
thanks manoj how many turns for 35uh ??

guyz the clear pdf artwork for the 4K5 have fun with real tested high power class d

Attached Files
 Amplificador Classe-D pg 74 4K5 trabalho.pdf (20.2 KB, 1262 views)

 25th October 2012, 08:24 AM #2722 Ouroboros   diyAudio Member     Join Date: Dec 2003 Location: Nottingham UK An ETD29 core with a 1mm gap in the centre leg only will have an inductance factor (Al) of close to 125nH. The equation for the total inductance (where N is the number of turns) is N^2 * Al. So 17 turns will give you roughly 35uH. If you are adding a 1mm gap to an ungapped core set (so the gap is in all legs), the Al will be much lower of course.
stewin
diyAudio Member

Join Date: Jul 2007
Quote:
 Originally Posted by Ouroboros An ETD29 core with a 1mm gap in the centre leg only will have an inductance factor (Al) of close to 125nH. The equation for the total inductance (where N is the number of turns) is N^2 * Al. So 17 turns will give you roughly 35uH. If you are adding a 1mm gap to an ungapped core set (so the gap is in all legs), the Al will be much lower of course.
thanks ouroboros

so gap in all legs it will come to how many turns to make 35uh

Last edited by stewin; 25th October 2012 at 12:52 PM.

 25th October 2012, 12:57 PM #2724 Ouroboros   diyAudio Member     Join Date: Dec 2003 Location: Nottingham UK It is not a parameter that is defined in the data for the cores. This is the time to buy a low cost inductance meter perhaps? When I get an unknown core, I wind a known number of turns on, measure the inductance and then determine Al. I then can use this value to calculate the mumber of turns needed for any required inductance on that particular core.
 25th October 2012, 01:01 PM #2725 jcoelhogsia   diyAudio Member     Join Date: Jul 2012 Location: goianesia-goias [/IMG]
 25th October 2012, 02:52 PM #2726 ravpreet420 diyAudio Member   Join Date: Oct 2009 irs 3000 coil inductance(uh) ?
 25th October 2012, 03:02 PM #2727 manojtm   diyAudio Member     Join Date: Aug 2008 Location: KERALA Hi stewin, i used 40T .85mm core 1mm gap all (@70uH) fsw=250KHz cap=2.5uF/250V, cool quite MOSFET IRFP250N with resistor 39 Ohm. Regards MANOJ
manojtm
diyAudio Member

Join Date: Aug 2008
Location: KERALA
Quote:
 thanks manoj how many turns for 35uh ??
Hi stewin,

use 28T for 35uH

regards
MANOJ

stewin
diyAudio Member

Join Date: Jul 2007
Quote:
 Originally Posted by manojtm Hi stewin, i used 40T .85mm core 1mm gap all (@70uH) fsw=250KHz cap=2.5uF/250V, cool quite MOSFET IRFP250N with resistor 39 Ohm. Regards MANOJ
what voltage? and speaker impedance? did you drive hard?

stewin
diyAudio Member

Join Date: Jul 2007
the component side side of pcb

thanks to ht forum

have all the fun with high power amps

" seek and you shall find "
Attached Images
 Amplificador Classe-D pg 74 components irs4k5.jpg (451.5 KB, 1254 views)
Attached Files

Last edited by stewin; 25th October 2012 at 07:14 PM.

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