We all know these simple principles.
That shows that Infineon and Texas Instruments are some liar businesses.
Then the data he released may also be false. Why should we make tpa3116, 3255, ma12070 😈
First you say it is digital because Infineon and TI say so.
Now you say they are liars.
What is it? Do you now understand that class D is an analog pocess?
Jan
Now you say they are liars.
What is it? Do you now understand that class D is an analog pocess?
Jan
https://www.diyaudio.com/community/...ss-d-is-class-ab-class-a.388305/#post-7076023
You can refer to here.
PWM regulated power supply. Or PWM amplifier.
In fact, it was born a long time ago. About 1960 years ago. Even before OCL amplifier.
Refer to the documentation for details.
Infineon and Texas Instruments list them as digital amplifiers.
If you have an opinion. You can email them. Let them modify the introduction of the document. I am behind you.
In fact, I'm not sure about their names. I'm not very interested in what I call it.
PWM amplifier is a very simple amplifier.
I don't understand why some people call it class D. Do you know why.
I think D means digital. Or class D is just a random name. No special significance?
Class D does not men digital, just as class A does not mean analog.
D becomes after the C in the alphabet, just the next one availabl.
Jan
D becomes after the C in the alphabet, just the next one availabl.
Jan
ljm_ljm; Here's one for ya,
For me, class D being digital / analog gets more blurred depending on how the analog is converted to the pulse width. Roughly, as I do not understand the detail, we have on one hand an analog process where an analog input is compared to a ramping voltage; as long as the analog input is less than the ramping voltage, PWM output is "1". As soon as the ramp voltage exceeds analog input, the PWM output is "0" or off.
A lot of music these days is digital encoded to begin with. So there's a digital word representing a sample of the music an some point in time. Now instead of an analog ramp, we have a counter, which counts up from 0 at a rate and some arithmetic logic unit in a loop compares this count to the value of the audio sample. As long as the counter is less than the value of the digital audio sample, the PWM is "1", when the counter value exceeds the audio sample value the PWM drops to "0" or off.
In this case, the PWM output value is the direct result of a comparative calculation done in a special purpose computer, cast in the same silicon as the rest of the amplifier. There's a 1:1 correspondence between the pulse "width" and the time it took for that counter to match the input audio sample word. The operation should be reversible; one should be able to get back to the sample word from a pulse width, which is just another numerical value that, put into a computer with the right programming, would crunch out to another number = the original PCM code.
My mind seems to have a valence for the idea that only when the PWM in an electrical form is integrated or filtered, does it then become an analog signal. To me, prior to that, it's just another realizable form of digital encoding; either a 1 or 0, on or off at various points in time. It's just how I see it, a perception that could be so wrong from another point of view. Certainly considering the devil's details that are missing in my thinking of it. Particularly that little bugger called closed loop feedback which I'd say all class D amplifier have in some form - what then?
For me, class D being digital / analog gets more blurred depending on how the analog is converted to the pulse width. Roughly, as I do not understand the detail, we have on one hand an analog process where an analog input is compared to a ramping voltage; as long as the analog input is less than the ramping voltage, PWM output is "1". As soon as the ramp voltage exceeds analog input, the PWM output is "0" or off.
A lot of music these days is digital encoded to begin with. So there's a digital word representing a sample of the music an some point in time. Now instead of an analog ramp, we have a counter, which counts up from 0 at a rate and some arithmetic logic unit in a loop compares this count to the value of the audio sample. As long as the counter is less than the value of the digital audio sample, the PWM is "1", when the counter value exceeds the audio sample value the PWM drops to "0" or off.
In this case, the PWM output value is the direct result of a comparative calculation done in a special purpose computer, cast in the same silicon as the rest of the amplifier. There's a 1:1 correspondence between the pulse "width" and the time it took for that counter to match the input audio sample word. The operation should be reversible; one should be able to get back to the sample word from a pulse width, which is just another numerical value that, put into a computer with the right programming, would crunch out to another number = the original PCM code.
My mind seems to have a valence for the idea that only when the PWM in an electrical form is integrated or filtered, does it then become an analog signal. To me, prior to that, it's just another realizable form of digital encoding; either a 1 or 0, on or off at various points in time. It's just how I see it, a perception that could be so wrong from another point of view. Certainly considering the devil's details that are missing in my thinking of it. Particularly that little bugger called closed loop feedback which I'd say all class D amplifier have in some form - what then?
PWM is not digital encoded - is is encoded with a level and on/off time, which all can vary in infinitisemal steps, and all being analog quantities: level and time.
Jan
I don't have much opinion. These nouns are not important.
At least there is no name difference. A is completely different from B.
However, CLASS A and CLASS B may be the same thing.
I don't care much about CLASS AB.
Yes, making up your own vocabulary is the surest way to kill any intelligent discussion.
Or maybe you just have no clue.
Off to the ignore list! (Getting crowded there).
jJn
Mosfet arc output IRFB4227
https://www.google.com/imgres?imgur...2ahUKEwj6r7q65vmAAxXjmmMGHd9MDHgQMygCegQIARA3