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Class D Switching Power Amplifiers and Power D/A conversion

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Old 5th March 2012, 03:45 PM   #341
cwier60 is offline cwier60  United States
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Quote:
Originally Posted by alkasar View Post
Quote:
Originally Posted by cwier60 View Post
The IRAUDAMP7D BOM shows 1N4003 for D5-6 but MUR120 for D3.
We dont read the same bom I read page 33 of IRF ref design. D3, D5, D6 are supposed to be mur120.
To clarify, the IRAUDAMP7D BOM shows 1N4003 for D5-6, whereas the IRAUDAMP7S BOM that you provide the link for shows MUR120. It's probably a moot point now.
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Old 9th March 2012, 03:27 AM   #342
ljm_ljm is offline ljm_ljm  China
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Quote:
Originally Posted by alkasar View Post
yes that's missing. I started the job. Did not yet identify them all.
The parts ref are those from the IRAUDAMP7S reference design, page 30. It's a L25D board picture.

Click the image to open in full size.
it's a preview of work in progress and there might be errors at this stage. I just found one

A question at this stage :
The reference design BOM recomends ultra-fast switching diodes for D3, D5, D6.
The kit comes with 1N4007 which are not known to be ultra-fast.
Is this something to worry about ?

You can be assured.Component configuration of the tube model UF4004, VISHAY, or MIC.
Parameters, it is the recovery time is 35NS. And MUR120 are the same.

Otherwise stated 22UF capacitor, they work within the regulator DC15V.
Pressure values ​​of more than 25V fully meet the need. Higher withstand voltage of the capacitor in order to reduce the capacitor the ESR.
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Old 9th March 2012, 03:34 AM   #343
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Quote:
Originally Posted by ljm_ljm View Post
Higher withstand voltage of the capacitor in order to reduce the capacitor the ESR.
That's interesting; are you sure about that?

I would have thought the opposite, because if you make a 50 V cap from two 25 V caps by connecting them in series, the ESR is doubled.

I don't know exactly how they make higher voltage caps, but one way would be with thicker dielectric material, and that would increase ESR.
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Old 9th March 2012, 03:52 AM   #344
ljm_ljm is offline ljm_ljm  China
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Quote:
Originally Posted by noah katz View Post
That's interesting; are you sure about that?

I would have thought the opposite, because if you make a 50 V cap from two 25 V caps by connecting them in series, the ESR is doubled.

I don't know exactly how they make higher voltage caps, but one way would be with thicker dielectric material, and that would increase ESR.

Capacitor of the same capacity. The greater the pressure, the greater the volume.

Height is inversely proportional to the ESR and capacitance when the capacitor height is higher, the internal anode aluminum anode paper, the greater the electrolyte area.
The smaller the impedance.
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File Type: jpg ESR.jpg (282.0 KB, 844 views)
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Old 9th March 2012, 03:56 AM   #345
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I see, thanks.
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Old 9th March 2012, 09:09 AM   #346
alkasar is offline alkasar  France
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thanks ljm.


the picture you copied above is the work in progress version. I wish I could edit the posts and remove it to avoid confusion!

The final and correct one is here : L25D board with parts cross reference


@cwier60 :
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Old 9th March 2012, 02:52 PM   #347
ljm_ljm is offline ljm_ljm  China
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Quote:
Originally Posted by alkasar View Post
thanks ljm.


the picture you copied above is the work in progress version. I wish I could edit the posts and remove it to avoid confusion!

The final and correct one is here : L25D board with parts cross reference


@cwier60 :
I hope you can smoothly
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Old 9th March 2012, 09:26 PM   #348
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So is there anyway to BRIDGE two L25D modules? and what would the power rating be?
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Old 10th March 2012, 12:42 PM   #349
MrSlim is offline MrSlim  Canada
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Originally Posted by solviken View Post
So is there anyway to BRIDGE two L25D modules? and what would the power rating be?
Bridging is "not supported" on the L20D equivalent in the reference design document(links to it are elsewhere on this thread or on the L15D thread), and the L25D is even higher power than it (a variant not discussed in the Ref Doc).

I'm not sure what would happen, but if the components are not capable of handling the load, it would probably end unhappily....

The L15D on the other hand should support bridging (500W@8ohms). The Reference Doc provides a bridging circuit..
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Old 10th March 2012, 12:44 PM   #350
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Thanks for answer But if i Bridge L15 would it be stable in 4 and 2 ohm? Was thinkin of using it as subwoofer amp!
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