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Class D Switching Power Amplifiers and Power D/A conversion

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Old 4th April 2013, 11:07 AM   #3411
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Join Date: Feb 2008
Hi Exflaco
greetings totem is MPSA42 MPSA56 isnt mpsa 42 complementary to mpsa 92
warm regards
"It's Better to try and fail than to never know and always wonder"
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Old 4th April 2013, 06:28 PM   #3412
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Join Date: Dec 2003
Location: Munich
Originally Posted by norazmi View Post
current rating its depend what type of mosfet you are using, 20-30 amp is enough.
...mostly true.
In classD the limitation often is not given by the current rating, but more by the switching losses and Rth of the MosFet.
Consequently a MosFet with good body diode and low Rth, but not impressive current rating, can easily outperform (also in terms of amp power) a stone age monster with poor body diode.
The higher your fs, the more this will apply.
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Old 5th April 2013, 07:11 AM   #3413
Join Date: Jan 2005
I've put together a "Universal Power Module (UPM) that supports both pre and post filter feedback, as well as clocked modulators.

Bottom layer: http://i.imgur.com/IRWpUxu.png
Top layer: http://i.imgur.com/rnssSzN.png

This is however just a preliminary layout that may change at any time.
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Old 7th April 2013, 11:34 AM   #3414
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Join Date: Sep 2010
Location: Quezon City
Anyone tried CD4069 for comparator? I want to save space for the pcb so I'll gonna try it instead of CD4049
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Old 7th April 2013, 11:39 AM   #3415
Join Date: Jan 2005
There was once a class d amplifier posted in this section that only had 4000 series or 74 series logic ics in the frontend, the OP was named nitrate and the amp was called madamp and it was a basic delta sigma approach.

Last edited by Tekko; 7th April 2013 at 11:49 AM.
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Old 7th April 2013, 06:48 PM   #3416
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Join Date: Oct 2009
Originally Posted by manojtm View Post
Hi Stewin,

can you tell me the air gap of ETD49 and EE19. A=?? for 95V load


Hi sweet,

I will give you the sprint layout file for AUD600 & Power AUD600

Hi Manoj.
Please send me that file too.

Thank you.
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Old 7th April 2013, 10:37 PM   #3417
stewin is offline stewin  Kenya
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hi all i am making at least a supply to reach 2.5 kwt with o.c protection just about to finish . any ideas would be highly appreciated
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Old 8th April 2013, 01:27 PM   #3418
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Join Date: Aug 2010
Originally Posted by IRSound View Post
Hi guys..

so I've just finished IRS1500..but there is also a problem

please watch this video :

Class-D IRSD1K5 - No & Low Level input Problem - YouTube

when i turn on power supply..after s short delay , speaker connected to amp's out. as you can hear in video , there is a noise available at output. (input volume = 0) and when i increase volume up to 4~5%, a really bad audio signal become appear. also the active led indicator isn't bright constantly.
when i increase the volume (about 7~8 %) the amp start to oscillate and those problem solved.

guys please help me. anyone have similar problems ?


hi IRSound ,i know your problem ,

change you IC CD4049 with other manufacture

i have same problem like you
and result are ok change IC CD4049 with ST manufacture ,before TI manufacture.
my irs can work at minimal 15 volt supply with out change RSS (6,8k)


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Old 8th April 2013, 06:50 PM   #3419
stewin is offline stewin  Kenya
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to add on the above . i had problems with irs4k5 outputs were heating , once i changed the cd4049 . everything was o.k and outputs stopped heating.
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Old 9th April 2013, 08:31 AM   #3420
manojtm is offline manojtm  India
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Location: KERALA
OP was named nitrate and the amp was called madamp
Hi Tekko,

Why you call madamp???

I think Delta-Sigma design was good one compare with other self oscillated design.
Low noise,No hum and clear sound.

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