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Old 25th October 2012, 07:20 AM   #2721
stewin is offline stewin  Kenya
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Quote:
Originally Posted by manojtm View Post
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

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Old 25th October 2012, 08:24 AM   #2722
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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.
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Old 25th October 2012, 12:29 PM   #2723
stewin is offline stewin  Kenya
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Quote:
Originally Posted by Ouroboros View Post
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.
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Old 25th October 2012, 12:57 PM   #2724
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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.
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Old 25th October 2012, 01:01 PM   #2725
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Old 25th October 2012, 02:52 PM   #2726
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irs 3000 coil inductance(uh) ?
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Old 25th October 2012, 03:02 PM   #2727
manojtm is offline manojtm  India
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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
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Old 25th October 2012, 03:36 PM   #2728
manojtm is offline manojtm  India
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Quote:
thanks manoj how many turns for 35uh ??
Hi stewin,

use 28T for 35uH

regards
MANOJ
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Old 25th October 2012, 04:58 PM   #2729
stewin is offline stewin  Kenya
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Quote:
Originally Posted by manojtm View Post
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?


thanks for reply
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Old 25th October 2012, 07:07 PM   #2730
stewin is offline stewin  Kenya
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the component side side of pcb

thanks to ht forum

Amplificador Classe-D - Página 74

have all the fun with high power amps



" seek and you shall find "

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