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Class D Switching Power Amplifiers and Power D/A conversion

ucd 25 watts to 1200 watts using 2 mosfets
ucd 25 watts to 1200 watts using 2 mosfets
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Old 11th January 2017, 01:12 PM   #4471
rhythmsandy is offline rhythmsandy
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Join Date: Aug 2012
Quote:
Originally Posted by kees52 View Post
Here she are.
Hi there are no S and BAL pins on the 311 spices
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Old 11th January 2017, 02:45 PM   #4472
rhythmsandy is offline rhythmsandy
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Tried simulating but im getting error as there are no lib files for the IR2110
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Old 11th January 2017, 03:02 PM   #4473
kees52 is offline kees52  Netherlands
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Quote:
Originally Posted by rhythmsandy View Post
Tried simulating but im getting error as there are no lib files for the IR2110
I did have the same, and I have the lib and sub, here she are, maybe you can find out, ltspice is sometimes difficult.

you can use .include IR21XX.lib but I did see I have a error with pins.
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File Type: zip ltspice-lib.zip (10.3 KB, 65 views)
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Old 11th January 2017, 03:29 PM   #4474
kees52 is offline kees52  Netherlands
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Quote:
Originally Posted by rhythmsandy View Post
wow thank you will post some sims soon.
I have a question about the Class D for subwoofer application. Do they have stability issues when either load is not connected or for extreme low frequencies?

The fundamental reason why i want to consider the full bridge and single supply is to avoid the bus pumping effect and i believe this circuit is also with post feedback so the DF could be more.

Did anyone tried this UCD with subwoofers with extreme usage in like PA with good results? I want to drive 21LW1400 from eighteen sound with excellent grip.
I believe full bridge do also not have problems with bus pumping.

here some info.

http://www.irf.com/product-info/audi...utorial606.pdf
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Old 11th January 2017, 06:00 PM   #4475
Pafi is offline Pafi  Hungary
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Join Date: May 2004
Location: Budapest
Quote:
Originally Posted by kartino View Post
In class D clipping sounds worse.

As I told before that during momentary clipping for self oscillating class D, PWM will stop for a moment and only pure DC will flow to speaker. And after clipping, it needs time to restart again the PWM. This event makes clipping in class D is worse than class AB.

It seems you don't have experience at all.
Experience is your privilege. Nobody else has it, unless he agrees with you.

ClassD clipping sound worse only if you make it wrong. If you do it right it returns to normal operation immediately after clipping. I also fallen to this error in my first big classD amp, but I didn't accept it, found the problem and corrected it.
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Old 11th January 2017, 06:09 PM   #4476
stewin is offline stewin  Kenya
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Join Date: Jul 2007
Quote:
Originally Posted by Dimonis View Post
I have many working projects , but they are mostly not UcD based . I don't like UcD - due to it's low loopgain it has heightened distortion , and if increase loopgain - it becomes unstable. I only use UcD for high (>1000W) power subamps, where THD is not the main criterion . And due to postfilter feedback can use less expensive output inductor, something like sendust ring cores....

Here is my old UcD bridge , cliplimiter on board.
thanks dimonis for sharing .nice layout .please post schematic of the project.

by the way which topology do you use nowadays of your class d amps??
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Old 11th January 2017, 06:43 PM   #4477
rhythmsandy is offline rhythmsandy
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tried simulating but Im getting a squarewave at the High input and low input.
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File Type: png ClassD_notworking.png (77.4 KB, 460 views)
File Type: png ClassD_notworking_High_LowIN.png (70.1 KB, 450 views)
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Old 11th January 2017, 06:45 PM   #4478
rhythmsandy is offline rhythmsandy
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ltspice file
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File Type: asc 002_ClassD_UCD_Style.asc (14.5 KB, 87 views)
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Old 12th January 2017, 02:55 AM   #4479
rhythmsandy is offline rhythmsandy
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can anybody please tell me whats wrong in the schematic?
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Old 12th January 2017, 07:22 AM   #4480
Pafi is offline Pafi  Hungary
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Quote:
Originally Posted by rhythmsandy View Post
can anybody please tell me whats wrong in the schematic?
Probably the input polarity of comparator. The polarity definition changes when you use the other output.
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