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Class D Switching Power Amplifiers and Power D/A conversion

PA Discrete Class D Amplifier Schematic
PA Discrete Class D Amplifier Schematic
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Old 1st July 2019, 06:14 AM   #11
kartino is offline kartino  Indonesia
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Quote:
Originally Posted by Reactance View Post
Are you serious? Have you seen the cost of a low propagation delay, fully differential comparator over a 6 transistor discrete design.?

I have it
But consider cost and footprint 555 is better choice
The same reason for prestage op amp.
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Old 1st July 2019, 06:18 AM   #12
kartino is offline kartino  Indonesia
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Quote:
Originally Posted by odnaizutra View Post
This kind of protection ,sometimes kicks in because of big decoupling cap value.
Never
This is first version ever I have my own UcD pro.
Later version including fullbridge UcD also very stable.
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Old 19th September 2019, 12:25 PM   #13
jkuetemann is offline jkuetemann  Canada
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Default Wanted to try this, sim first.

Kartino,


I am trying to simulate your design in post 1, for the purposes of the sim leaving out the protection and font end buffers, and am getting a completely intractable -12 or so offset on the output. I am also using 80V supplies as I have several transformers that would give that voltage after rectification and filtering. I have experimented with different transistor types but that doesn't seem to matter, nor does the offset adjustment seem to do anything.


Would yo mind taking a peek at the schematic and see if I'm just blind to a mistake or if you can offer some suggestions on ridding the sim of the offset?
Attached Files
File Type: asc UcD.asc (19.9 KB, 10 views)
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Old 20th September 2019, 02:20 AM   #14
jkuetemann is offline jkuetemann  Canada
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N'er mind. Found my bone-headed mistake.
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Old 20th September 2019, 11:51 AM   #15
NMOS is offline NMOS  Germany
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Quote:
Originally Posted by jkuetemann View Post
N'er mind. Found my bone-headed mistake.

does it work stable now ?
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Old 20th September 2019, 11:58 AM   #16
jkuetemann is offline jkuetemann  Canada
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Seems to, but then I'm a real newb when it comes to Class D. My historical experience is with Class A / AB. Was looking for a (mostly) discrete design and this caught my attention.
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Old 21st September 2019, 05:04 PM   #17
NMOS is offline NMOS  Germany
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Quote:
Originally Posted by jkuetemann View Post
Seems to, but then I'm a real newb when it comes to Class D. My historical experience is with Class A / AB. Was looking for a (mostly) discrete design and this caught my attention.
Does Cartino discret working stable same like D4K5 ?

Who does build this discret Class D Amp ?

Feedback ?
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