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Class D Switching Power Amplifiers and Power D/A conversion

Class D AMP using only TL494
Class D AMP using only TL494
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Old 11th August 2016, 02:29 PM   #11
oscar alejandro gome is offline oscar alejandro gome  Argentina
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that we fet used
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Old 30th July 2017, 02:26 AM   #12
Shevchenko is offline Shevchenko
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Según el voltaje de alimentación y el que menor Rs On
According to the supply voltage and the smaller Rs On
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Old 16th August 2017, 10:25 AM   #13
bomtee is offline bomtee
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hello why i can't run TL494?
it show "could not open library file "..\sym\Valvol\ValVol.lib"

thank you for suggestions
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Old 1st January 2018, 02:58 PM   #14
sparkymark is offline sparkymark
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Quote:
Originally Posted by Acca View Post
You .can't modulate it by this way.You can try this:
I did build this design from parts extracted from an old computer power supply including the choke and purchased a bunch of TL494 devices for cents each. Using a breadboard this worked first time, the driver FET does get a little warmbut I did get the amp to run quite nicely at 15 volts up to 30Volts and did not take long to patch together. The sound quality was really very good despite not having a perfect filter (had about 20mv of 100Khz ripple with the bits I had at hand) and the bass was really excellent. If this was used in a general purpose stereo it would not be too shabby

I tried regulating the supply to the 'driver side' to get some control over the heat but the circuit did not behave as well so not sure quite how the design is working so any technical background would be helpful however I intend to play with a proper driver as a primary playground.

Thanks for posting this...
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Old 3rd January 2018, 07:04 PM   #15
ICG is offline ICG  Germany
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Location: I had a Déjà Moo - I've seen that BS before!
If you already got some kind of small heatsink and it still gets warm, you probably have to adjust the dead time. That's done via the voltage on pin 4 (DTC, dead time comparator input voltage). The datasheet (PDF) says more about that.
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Old 6th June 2018, 03:34 PM   #16
Mara8 is offline Mara8
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que valor de inductor deberia utilizar y que valores en los voltajes de entrada si quiero 5W en la salida
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