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Old 7th November 2010, 01:51 AM   #1
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Default My discrete class d project

Just started on a new project, a class d discrete approach.

Uses triangle wave generator, comparator, xor phase splitter and irs2113 hi/lo side switch.

Still in the testing stage.

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Old 7th November 2010, 01:54 AM   #2
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Old 7th November 2010, 11:38 PM   #3
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Circit diagram.
A bit small due to screen capture.

Click the image to open in full size.
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Old 9th November 2010, 11:03 PM   #4
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Still testing.

Got the square wave and ramp working cleanly by adjusting components.

Designed improved level translator from output of comparator to xor gates.
This works cleanly now.

At this point it outputs sound althogh with a little more noise than i would like.
Found tweaking the DC offset improved the noise situation.

Output MOSFETs were getting warm so changed gate resistors from 10R to to 56R now they stay cold.
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Old 9th November 2010, 11:22 PM   #5
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can you provide a readable schematic?

regards,
savu
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Old 9th November 2010, 11:31 PM   #6
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Quote:
Originally Posted by savu View Post
can you provide a readable schematic?

regards,
savu
Thats the best i can do without chopping it up into quarters and then it would be meaning less.

My earlier message explains all the stages.
Ramp generator and audio input, comparator, xor phase splitter, hi/lo side switch into irfb4019 mosfets.

Its pretty basic really. Sadly takes more components than a 2092 circuit but what components it uses are very cheap. The inductor is the most expensive part then the 2-50 IRS2113.
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Old 10th November 2010, 03:34 AM   #7
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Here is a similar project with discrete parts,

+/-45Vdc supply, 150W RMS into 4 ohm, 250khz, 0.31% THD @ max power, 1.6W dissipated per Mos Fet.

It only exists in LTspice, I never built it.

Regards,
savu
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Old 11th November 2010, 05:27 PM   #8
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Quote:
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It only exists in LTspice, I never built it.
Well then would you mind if i build it? However i'll use higher supply rails and two pairs of MOSFETs, i need 200-300W on 8 ohms.
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Old 11th November 2010, 05:49 PM   #9
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I wouldn't mind.

tell me the exact configuration and the parts that you intend to use in order to redesign it for you're specific needs.

regards,
savu
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Old 11th November 2010, 06:04 PM   #10
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I'll have to examine the schematic more thoroughly - i'll do so in the weekend.
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