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Class D Switching Power Amplifiers and Power D/A conversion

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Old 26th March 2013, 01:07 PM   #211
manojtm is online now manojtm  India
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Quote:
For -/+95 supply which components should be changed? Can I use irfp250n?
Hi Raj,

IRFP250N will work @4R load only.Not support short circuit, 2R load and Bridge

use 250V 80A Mosfet for safe @+/-95V supply range

Regards
MANOJ

Last edited by manojtm; 26th March 2013 at 01:37 PM.
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Old 26th March 2013, 04:13 PM   #212
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great work ......manoj sir
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Old 27th March 2013, 06:49 AM   #213
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Manoj, how about FDA59n25 or 60 A transistors? 80 A is a must? there is IRFP4768 but seems to be very expensive(about 5 times according to 59n25), maybe we shoul search something like 80n25 series?
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Old 27th March 2013, 05:29 PM   #214
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i can have:
IXFH100N25P 5,47 EUR/1 pcs exl. VAT, min. 30 pcs in 2-3 weeks

IXTH76N25T 2,68 EUR/1 pcs exl. VAT, min. 30 pcs in 2-3 weeks

but this is not cost-effective i think, maybe its easier to use two pairs?

FDA59n25 cost is about 1,25 EUR including VAT. and they are widely avaible from 1 PC. what do you think about it?

i Have another question.
Power board is unconventional, and somebody would like to use SMPS for this amp, what would be difference between this powerboard in that option?

Last edited by adamkaktus; 27th March 2013 at 05:37 PM.
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Old 30th March 2013, 09:37 AM   #215
manojtm is online now manojtm  India
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Hi Adamkaktus,

use IXFH100N25P or 2x FDA59N25

there is no issues using SMPS or Linear Power supply

Regards
MANOJ
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Old 1st April 2013, 06:08 PM   #216
stewin is offline stewin  Kenya
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Originally Posted by manojtm View Post
Hi ALL,

My AUD600 Rev 3.0.1 Power Board Shematic

Regards
MANOJ
hi sir manoj. what about the amp schema?

and what can i do to eliminate rf noise at high frequencies when it is playing loud . but issue occurs when using two channels . maybe it is because i never used 220uh inductor at aux 12volts for powering ir2110 ic.
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Old 3rd April 2013, 11:22 AM   #217
manojtm is online now manojtm  India
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Quote:
what can i do to eliminate rf noise at high frequencies when it is playing loud
Hi stewin,

did you ground the heat-sink(IRF250N Mosfet) with 1R or 10R resistor??
and Power GND should be in one point or good shielded GND
Quote:
what about the amp schema?
AUD600 ver3.0.1, after testing i will post

Regards
MANOJ
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Old 4th April 2013, 07:06 PM   #218
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Hi Manoj, i've bought few fda59n25 for test, but i will wait for new version. Can i replace 5551 and 5401 with mpsa 42/92?
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Old 5th April 2013, 03:06 PM   #219
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Default best class d ever made ... :)

thank u sir manoj for ur amp. very clear and good sound .. 22uh inductor @+/-63vdc .irfp250n no heat sink fets on 55degree .
can need any changes for +/-140 vdc .??? i n not useing 220uh for aux 12v.
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Old 5th April 2013, 07:52 PM   #220
akraj is offline akraj  Bangladesh
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Originally Posted by aman khalsa View Post
thank u sir manoj for ur amp. very clear and good sound .. 22uh inductor @+/-63vdc .irfp250n no heat sink fets on 55degree .
can need any changes for +/-140 vdc .??? i n not useing 220uh for aux 12v.

Congrats, what type of core you are using? How many turns you gave?

It seems that you are not using 47R and 104 caps, any reason?
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