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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 23rd July 2017, 11:50 AM   #4611
kartino is offline kartino  Indonesia
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Location: Gunungkidul Indonesia
Core use 2x MS157060. High volt is high amp means bigger core.
No issue on stability and noise.
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Old 23rd July 2017, 11:55 AM   #4612
kartino is offline kartino  Indonesia
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BTW we all go for fullbridge.
90Vdc supply can have plenty power. Real power.
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Old 24th July 2017, 05:24 PM   #4613
Roby Tengara Setiawa is offline Roby Tengara Setiawa  Indonesia
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Quote:
Originally Posted by kartino View Post
BTW we all go for fullbridge.
90Vdc supply can have plenty power. Real power.
Yes..... In Indonesia, We all go for Fullbridge or BTL.
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Old 1st August 2017, 01:38 PM   #4614
kimzaaz is offline kimzaaz
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An externally hosted image should be here but it is no longer accessible. Please upload images instead of linking to them to prevent this.
fullbridge pcb
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Old 1st August 2017, 05:32 PM   #4615
protech1104 is offline protech1104  Tunisia
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Hello. I wanted your help to understand. I did the test of my class amp d. I measure the temperature of the heatsink. Psu + -70v output amplifier loaded by resistive dummy load. 8ohm 56 ° after one hour. 4 ohm 85 ° after half an hour and protection cuts. The test is done with hard rock music at clipping. is it normal. Now I do not have the speaker that support this power to test in real load. Do the speaker require less power. Help me please to understand if this temperature is normal. With 6 ohm after one hour 65 °
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Old 14th October 2017, 10:22 AM   #4616
sumeshak is offline sumeshak
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Sir,
can you please share the details and the layout for class H PSU?
Thanks
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Old 14th October 2017, 10:24 AM   #4617
sumeshak is offline sumeshak
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Sir,
Can you pls share the class H PSU layout?
Regards,,
Sumesh
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Old 21st October 2017, 07:45 AM   #4618
us1070 is offline us1070  India
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Location: Goa
Hi i am looking to buy these Classd board where can i buy i am from Goa

Why is nobody selling it?

For example:
Thailand Detex Audio
Indonesia Classd Neo
Sameer Digital Audio
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Old 25th October 2017, 08:47 AM   #4619
Grizlek is offline Grizlek
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Quote:
Originally Posted by kees52 View Post
Did you guys tri sic mosfets? these are very fast, like 14-24 49 nS for 90 amps version, but needs a special driver as I did read, needs -2 to -5 bias voltage and 20 volts gate drive, these are as such complicated?

But in sim I get pretty low distortions, even on 8 amps 4 ohms.

with 1.4 amps output it is very very low, for simplicity there is not yet a proper dead time.

The feed forward network on output is quite nice to recover fase behavior for stable oscillation and frequenty setup together with the low pass opamp in input, I did read this stuff and have now sim it, I go try also with the IR 2011S chip, that way I can make better pcb with lower parasitics..

regards
What kind of "UCD" type feedback is this. Can you post some link related? Resembles one old Oersted univerity file. Still have you every tried such feedback in real life. What about stability, etc ? (you put square input, what you get at output, etc). Even author of original file from Oersted did not try this in real life.. As we see 12 pF caps, etc.

Still this may be superior comapred to "UCD+" from russian forums, if THD is constant, and not dependent on frequency. Still I wonder how this behaves when we change speaker impedance 2 ohm 4 ohm 8 ohm, can it work without output filter change. Classic UCD and UCD+ according to spice, can.

but I am really afraid if we put here square input that output may not be stable. (will not resemble as square also). you can see my previous posts...(similar feedback) but not that advanced.

Output stage like output stage, but am an interesting in feedback,. good feedback can make crappy output stage very low hd... (Lety say big dead time)

Last edited by Grizlek; 25th October 2017 at 09:12 AM.
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Old 25th October 2017, 10:51 AM   #4620
Grizlek is offline Grizlek
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Quote:
Originally Posted by Grizlek View Post
What kind of "UCD" type feedback is this. Can you post some link related? Resembles one old Oersted univerity file. Still have you every tried such feedback in real life. What about stability, etc ? (you put square input, what you get at output, etc). Even author of original file from Oersted did not try this in real life.. As we see 12 pF caps, etc.

Still this may be superior comapred to "UCD+" from russian forums, if THD is constant, and not dependent on frequency. Still I wonder how this behaves when we change speaker impedance 2 ohm 4 ohm 8 ohm, can it work without output filter change. Classic UCD and UCD+ according to spice, can.

but I am really afraid if we put here square input that output may not be stable. (will not resemble as square also). you can see my previous posts...(similar feedback) but not that advanced.

Output stage like output stage, but am an interesting in feedback,. good feedback can make crappy output stage very low hd... (Lety say big dead time)
I just tried this feedback in general D class setup (generic) ideal switches and fixed deadtime..

Seems not stable,

square wave input, graph shows pwm section and output
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