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Class D Switching Power Amplifiers and Power D/A conversion

SystemD_2kW, any interest for an open design?
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Old 12th February 2013, 07:57 PM   #251
ChocoHolic is offline ChocoHolic  Germany
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The PCB has arrived.
Attached two pictures which show the 'third layer' - the CuBar connection between series diodes and MosFet drains.
The double pin rows are intended to comfort the leads of the TO247 with low inductance and at keep the design serviceable.
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File Type: jpg CuBar1.jpg (136.8 KB, 746 views)
File Type: jpg CuBar2.jpg (123.6 KB, 726 views)
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Old 13th February 2013, 04:24 AM   #252
Workhorse is offline Workhorse
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Nice pcb's Choco
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Old 13th February 2013, 04:56 AM   #253
megajocke is offline megajocke  Sweden
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I just found this thread a few days ago. Very interesting project, ChocoHolic.
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Old 13th February 2013, 08:42 AM   #254
Reactance is offline Reactance  South Africa
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Good work,I'm more interested in the scope timing diagrams.
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There’s nothing worse than the smell of burned output transistors!!
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Old 13th February 2013, 11:22 AM   #255
effebi is offline effebi  Italy
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On a DIY point of view, what about output inductor ?
Are you recommending something specific, at least for the core, or can it be freely interpreted (doubt so). I find often coils the less DIYable stuff around.
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Old 13th February 2013, 07:21 PM   #256
ChocoHolic is offline ChocoHolic  Germany
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@Reactance:
I am afraid - I have to assemble and debug it first.
But then I will post some screen shots as well.

@Effebi:
My first choice is a T157-2.
But I have given enough space in the PCB to comfort a large gapped ferrite E-core.
Most ferrite E-cores which offer an Ae around 200mm˛ should allow a useable solution.
In case you seriously consider to built the amp and have a specific core on hands we can go through the design procedure.
Please note, if you use a gapped E-core you should use HF-litz or at least DIY-multistranded, not a solid wire.
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Old 14th February 2013, 06:38 PM   #257
ChocoHolic is offline ChocoHolic  Germany
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...here an illustration how the dual pin rows are used to comfort the TO247.
(Not shown here is the angular piece of aluminium between the back2back placed semiconductors.)
Attached Images
File Type: jpg DualPinTO247_1.jpg (157.2 KB, 631 views)
File Type: jpg DualPinTO247_2.jpg (113.5 KB, 591 views)
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Old 14th February 2013, 06:55 PM   #258
ViennaTom is offline ViennaTom
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@ Choco just FYI:

Today I had a meeting with guys from PowerInt (actually guys from Munich!). There is an upcoming 200V "Q-speed" diode series: 20, 30, 40 Amps. Unfortunately I can't find the specific 200V parts at their website.

Qspeed Family of Advanced Diodes | Power Integrations

Last edited by ViennaTom; 14th February 2013 at 07:05 PM.
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Old 15th February 2013, 02:16 PM   #259
ChocoHolic is offline ChocoHolic  Germany
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Thanks for the link, Tom.
Already the existing LQA60A300C
http://www.powerint.com/sites/defaul...lqa60a300c.pdf
is a beauty.

..and to keep the readers happy until my proto goes on... -some pictures of my preferred output choke.
T157-2 with 33turns (most likely I will reduce it to 32 turns).
Solid wire of 1.32mm diameter.
I am offering to support other custom choke designs with gapped ferrites and multistranded twisted wires on request.
Attached Images
File Type: jpg T157_pic1.jpg (161.3 KB, 539 views)
File Type: jpg T157_pic2.jpg (173.2 KB, 171 views)
File Type: jpg T157_pic3.jpg (92.1 KB, 191 views)
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Old 15th February 2013, 02:46 PM   #260
clocktower is offline clocktower  United Kingdom
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very nice
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