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Class D Switching Power Amplifiers and Power D/A conversion

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Old 27th January 2013, 01:23 AM   #81
abetir is offline abetir  Philippines
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.ups just did my research..I found 2 pdf version, the other with the trimmer for frequency adjust.

Filter : T106-2 0.8mm wire @59Turns(@47uH). Is this connected by joining the tracks for 470nf & 1uf ?

Thanks!
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Old 28th January 2013, 03:50 AM   #82
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Hi sir manoj
how are you today ?
i try to creat filter for aud600 with etd29
i was try that with 2 wire 0.8 in same side for 70uh and 25uh.
when i did conect 25uh then filter get hot and amp not woked
why ?
thanks
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Old 29th January 2013, 10:50 PM   #83
abetir is offline abetir  Philippines
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Hi!

Anyone with knowledge on class D amps...question here, can this inductor be used as alternative for 220uH choke coil on AUD600?

Thank You!

(I wonder why the contributor has gone silent, It's been a while, i'm currently collecting parts for AUD600...guess I needed guidance.)
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Old 30th January 2013, 05:19 AM   #84
manojtm is offline manojtm  India
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Hi abetir,

Yes you can use drum coil for low supply rails(max.+/-35V),220uH don't need for 250KHz fsw

Regards
MANOJ
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Old 30th January 2013, 05:27 AM   #85
manojtm is offline manojtm  India
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Quote:
i was try that with 2 wire 0.8 in same side for 70uh and 25uh.
when i did conect 25uh then filter get hot and amp not woked
why ?
Hi Hadi,

Don't use second windings and I won't give you the TIPs now regarding for reducing EMI and THD+N.
Don't misunderstand me.

Regards
MANOJ
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Old 30th January 2013, 06:08 AM   #86
abetir is offline abetir  Philippines
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Quote:
Originally Posted by manojtm View Post
Hi abetir,

Yes you can use drum coil for low supply rails(max.+/-35V),220uH don't need for 250KHz fsw

Regards
MANOJ
Hi Manoj,

..is it 220uH specific? Will a 100uH be able to work also..?

Thanks!
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Old 30th January 2013, 08:29 AM   #87
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Default thanks to sir manoj

Quote:
Originally Posted by manojtm View Post
Hi Hadi,

Don't use second windings and I won't give you the TIPs now regarding for reducing EMI and THD+N.
Don't misunderstand me.

Regards
MANOJ
hi
thanks
as you wish
have nice day
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Old 30th January 2013, 12:50 PM   #88
manojtm is offline manojtm  India
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Quote:
..is it 220uH specific? Will a 100uH be able to work also..?
Hi abetir,

for 250KHz fsw use up to 70uH coil

Regards
MANOJ
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Old 30th January 2013, 10:45 PM   #89
abetir is offline abetir  Philippines
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Quote:
Originally Posted by manojtm View Post
Hi abetir,
for 250KHz fsw use up to 70uH coil
Regards
MANOJ
Thank you Manoj, I'll get back to you as soon as I have completed one board for a test..

I will be using these pair for the inductor...
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Old 31st January 2013, 02:11 PM   #90
manojtm is offline manojtm  India
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Hi All,

My new AUD600 supply +/- 65V fsw @425KHz IRFP250N Mosfet working good cool for mid volume for high little heat with small heatsink

Regards
MANOJ
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