ucd 25 watts to 1200 watts using 2 mosfets - Page 194

savu · 10th May 2012, 12:14 PM

So if it is ok to use just ~ 130khz, why does hypex and others use 400khz or more?regards

luka · 10th May 2012, 12:56 PM

Quote:

Originally Posted by savu

So if it is ok to use just ~ 130khz, why does hypex and others use 400khz or more?regards

yea why listen to 320kbps MP3 or FLAC, if you can listen to 96kbps or less

manojtm · 11th May 2012, 07:40 AM

hi luka, I am not blessed with GOLDEN EAR !!!!
MP3 is a compressed format 96KHz is very low 320Khz is highest sample one, so you will feel the difference.
i said the real digital format (wave=44.1KHz)analog to digital converted and DVD audio 48KHz you cannot compare this with any compressed format

luka · 11th May 2012, 08:33 AM

Quote:

Originally Posted by manojtm

hi luka, I am not blessed with GOLDEN EAR !!!!
MP3 is a compressed format 96KHz is very low 320Khz is highest sample one, so you will feel the difference.
i said the real digital format (wave=44.1KHz)analog to digital converted and DVD audio 48KHz you cannot compare this with any compressed format

I didn't comment on what source you use, just for amp that some believe is enough, if it is low switching freq.... I compared it to bad and better audio file, where you CAN hear the difference, if you want to

Pafi · 11th May 2012, 12:36 PM

The crocodile is longer than green. Especially the left. Meaningless comparisons.

Somebody who really knows something about ClassD audio will not make such generic statements. Especially about a never seen circuit.

An amp with low switching frequency can sound perfectly. But nobody said this is unconditional.

High fsw has advantages and disadvantages also!

andrewlebon · 11th May 2012, 02:24 PM

Hi Irvynejay
greetings any news on totem pole hows it going
warm regards
andrew lebon

CPX · 08:10 PM

I am unable to solve a failure mode of this amplifier...one mosfet always burns during protection turning on and and a very small pulse is present.With larger pulse nothing burns.
Please help..i lost over 40 transistors with this problem...

Two caught cases

blue..protection rise
yallow..output

Pafi · 18th May 2012, 09:38 PM

More info is needed to understand what is seen on the pictures, but there is a known issue similar to your description: IR2... high side drivers can stuck in on state if turning off follows turning on in very short time (~ 50 ns or less)

CPX · 19th May 2012, 04:02 PM

Ok...please tell me what aditional info you need....
Thank you for responding

.

CPX · 19th May 2012, 07:52 PM

Normal shutdown pictures:

Not clipping before short:

Clipping before short:

10th May 2012, 12:14 PM	#1931
savu diyAudio Member Join Date: Feb 2007 Location: Cluj - Napoca	So if it is ok to use just ~ 130khz, why does hypex and others use 400khz or more?regards __________________ 1'st rule of chess: The only way to get smarter is by playing a smarter opponent.

11th May 2012, 02:24 PM	#1936
andrewlebon diyAudio Member Join Date: Feb 2008	Hi Irvynejay greetings any news on totem pole hows it going warm regards andrew lebon __________________ [image][/image]"It's Better to try and fail than to never know and always wonder"

18th May 2012, 07:50 PM	#1937
CPX diyAudio Member Join Date: Nov 2004 Location: Cluj	I am unable to solve a failure mode of this amplifier...one mosfet always burns during protection turning on and and a very small pulse is present.With larger pulse nothing burns. Please help..i lost over 40 transistors with this problem... Two caught cases blue..protection rise yallow..output Last edited by CPX; 18th May 2012 at 08:10 PM.

19th May 2012, 04:02 PM	#1939
CPX diyAudio Member Join Date: Nov 2004 Location: Cluj	Ok...please tell me what aditional info you need.... Thank you for responding.

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11th May 2012, 07:40 AM	#1933
manojtm diyAudio Member Join Date: Aug 2008	hi luka, I am not blessed with GOLDEN EAR !!!! MP3 is a compressed format 96KHz is very low 320Khz is highest sample one, so you will feel the difference. i said the real digital format (wave=44.1KHz)analog to digital converted and DVD audio 48KHz you cannot compare this with any compressed format

11th May 2012, 12:36 PM	#1935
Pafi diyAudio Member Join Date: May 2004 Location: Budapest	The crocodile is longer than green. Especially the left. Meaningless comparisons. Somebody who really knows something about ClassD audio will not make such generic statements. Especially about a never seen circuit. An amp with low switching frequency can sound perfectly. But nobody said this is unconditional. High fsw has advantages and disadvantages also!

18th May 2012, 09:38 PM	#1938
Pafi diyAudio Member Join Date: May 2004 Location: Budapest	More info is needed to understand what is seen on the pictures, but there is a known issue similar to your description: IR2... high side drivers can stuck in on state if turning off follows turning on in very short time (~ 50 ns or less)

19th May 2012, 07:52 PM	#1940
CPX diyAudio Member Join Date: Nov 2004 Location: Cluj	Normal shutdown pictures: Not clipping before short: Clipping before short:

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