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Class D Switching Power Amplifiers and Power D/A conversion

Class D amp using TL494
Class D amp using TL494
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Old 12th December 2006, 05:07 AM   #101
stepheno is offline stepheno  South Africa
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Location: Pretoria, Transvaal, South Africa
Default Half-Bridge Sigma-Delta UCD

Hello Ledmania,
Are you still around?
Just to let you know and make you glad: I have taken your half-bridge topology as suggested in your very first post (not really new to me and not new to the Japanese as you yourself witnessed - also not new to anyone designing power converters). I then took the IR reference design and combined the two into a Sigma-Delta UCD. The IR circuit is vastly simplified and improved.
Sincerely,
Stephen
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Old 13th December 2006, 08:20 AM   #102
ledmania is offline ledmania  Philippines
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Hi stepeno! Yes, I'm still around but not as frequent as I'm in Manila because I'm back again here on board the ship.
I'm glad that you resurected my long burried thread and I,m trying to imagine what sigma delta modulation you applied on it
Care for a schemo?

regards ledmania
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Old 19th December 2006, 08:43 PM   #103
Tekko is offline Tekko
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Post schems and pics, others may want to see.
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Old 21st December 2006, 11:26 AM   #104
stepheno is offline stepheno  South Africa
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Hello Ledmania,
Interesting of you being on ships!
Tekko,
Unfortunately I am not providing a circuit.
I can but say that when compared to the IR design, it is so simplified that no level shifter and no negative voltages are required.
Sincerely,
Stephen.
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Old 22nd June 2007, 08:18 PM   #105
eltonseemann is offline eltonseemann  Brazil
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Thumbs up hi folks!!! Im new here

I implement ledmania concepts for tl494 based pwm but I use the IR mosfet driver IR21844 that simplifies a lot the work. No overcurrent nor external deadtime has aditioned (the IR driver introduct programed deadtime).
I found problems when more volume is used. The sound is distorced at peaks. Any sogestion for correct this?? What possibles causes? Any associated to mosfet driver at longer duty cycles?
I work at aprox. 120Khz (tried lower too)
+-56V source, commom mode voltage at error amp of tl494 = 3,6V (the app report from texas pag.8 afirm that work which commom-mode voltage range from -03V to 2V less than Vi)
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Old 23rd June 2007, 05:47 AM   #106
eltonseemann is offline eltonseemann  Brazil
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layout
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Old 23rd June 2007, 11:28 AM   #107
eltonseemann is offline eltonseemann  Brazil
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layout
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Old 14th February 2011, 04:32 PM   #108
altium is offline altium  Bulgaria
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Hi Ledmania,
I cannot open your schematic from this chapter: http://www.diyaudio.com/forums/class...tml#post764418

Can you upload him correctly, please?
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Old 15th February 2011, 12:23 AM   #109
Pafi is offline Pafi  Hungary
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Quote:
Originally Posted by eltonseemann View Post
I implement ledmania concepts for tl494 based pwm but I use the IR mosfet driver IR21844 that simplifies a lot the work. No overcurrent nor external deadtime has aditioned (the IR driver introduct programed deadtime).
I found problems when more volume is used. The sound is distorced at peaks. Any sogestion for correct this?? What possibles causes? Any associated to mosfet driver at longer duty cycles?
I work at aprox. 120Khz (tried lower too)
+-56V source, commom mode voltage at error amp of tl494 = 3,6V (the app report from texas pag.8 afirm that work which commom-mode voltage range from -03V to 2V less than Vi)
I don't know what is the reason for your distortion, but this schematic looks horrible (no junction points, hardly readable characters), and basically the feedback is designed not at all. OPA without feedback: bad idea. IR21844 has too much dead time. (400 ns is too much.)
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Old 12th November 2014, 10:26 AM   #110
luizcpimenta is offline luizcpimenta  Brazil
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Quote:
Originally Posted by eltonseemann View Post
layout
Bom dia.
Conseguiu fazer funcionar esse amplificador?

Abrašo
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