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Class D Switching Power Amplifiers and Power D/A conversion

Philips UCD application note
Philips UCD application note
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Old 20th April 2007, 08:59 PM   #411
blmn is offline blmn  Brazil
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And i have the full calculation set for my trafo elsewhere at home.

I can find it and send for you.

regards,
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Old 20th April 2007, 09:03 PM   #412
luka is offline luka  Slovenia
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Philips UCD application note
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What would be great, thanks. I'll be waiting for your calculations, coz that much drop is too big for me too, but it is as big as it is. Maybe still didn't wind it that good
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Old 20th April 2007, 09:04 PM   #413
blmn is offline blmn  Brazil
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What are:

-max current at full load;
-wire gauge used on both sides;
-voltage drop used in your math and
- material of etd44 core.
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Old 20th April 2007, 09:20 PM   #414
luka is offline luka  Slovenia
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max current let say 8-9A, wire has little less than 1mm diameter so AWG 19 I think, voltage drop? where?, material is N87 or N67, don't know because there is company in my country that makes ferrites and have diffrent markings.
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Old 20th April 2007, 09:31 PM   #415
blmn is offline blmn  Brazil
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The voltage drop at output at full load.

Some information about minimum voltage ac input would be good too.

Show some pictures of the core, if possible.
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Old 20th April 2007, 09:41 PM   #416
luka is offline luka  Slovenia
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Philips UCD application note
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Huh voltage drop at output at full load, that I didn't use as there wasn't need from me to do that. I would say that it would drop to min of +/-30Vdc since unregulated and for min input 200Vac, but that isn't important since this is unregulated for now and if input voltage is lower so is output and I see this as false operation.

Here is pic of trafo, still a lot of room for windings
http://2ner.angelcities.com/slike/SmpsHB.jpg
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Old 21st April 2007, 06:02 AM   #417
blmn is offline blmn  Brazil
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Ok.

I think it is enough to a first approach.

Since itīs no more a class d question, Iīll reply for you by e-mail or Iīll open another thread at power supply foruns, ok?

Itīs 3:00 am here and you will receive a reply as soon as possible.

regards,
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Old 21st April 2007, 06:14 AM   #418
luka is offline luka  Slovenia
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Yes email me that would be best since this is not in anyway related to classD.
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Old 24th April 2007, 08:49 AM   #419
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In this DIY UCD, in the input differential, there are capacitors C42-C44 valued 22pf connected to ground.

What is the function of these capacitors?
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Old 24th April 2007, 09:02 AM   #420
luka is offline luka  Slovenia
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I think that they are there to decrease gain at high freq., I think...
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