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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 6th February 2012, 02:57 PM   #1611
savu is offline savu  Ireland
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IRFB4227 is best suited. You can use rails as high as 90v.
Regards,
Savu
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Old 6th February 2012, 04:19 PM   #1612
CPX is offline CPX  Romania
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For andrewlebon :
irfb4227.Also try irfb5615

For manojtm .
Please measure THD and IMD of your design and post results here if you can.
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Old 6th February 2012, 06:17 PM   #1613
Dimonis is offline Dimonis  Russian Federation
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Quote:
Originally Posted by andrewlebon View Post
Hello
greetings can any one advice me which is most suitable mosfet for this amp
i am using IRF250 on50 volt dc rails
1 IRFB4103Pbf
2 IRFB 4227BPbf
data sheet of IRFB4103 shows Rds on@10 volts 139Mohm
data sheet of IRFB4227 shows Rds on@10 volts 19.7Mohm
can anyone advice me most suitable mosfet
warm regards
andrew lebon
Catch
It's for rail up to +-65V
The "lightest" , I.e. prefered from the top.
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Last edited by Dimonis; 6th February 2012 at 06:23 PM.
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Old 6th February 2012, 06:26 PM   #1614
Dimonis is offline Dimonis  Russian Federation
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If you desire up to 90V per rail
These will suite well.
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Old 7th February 2012, 04:01 PM   #1615
Dwenson is offline Dwenson  Philippines
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Quote:
Originally Posted by stewin View Post
no i did not use clipping indicator but i am going to do so .on the over temp issue i used a 0.1 ohm resistor when i connect it the led does not light but when i disconnect it the led lights and relay does not go off . here is my part of the schema
whats the use of J10? when R34 and c39 are in parallen to ground? have you tested it on actual run?
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Old 8th February 2012, 02:35 AM   #1616
andrewlebon is offline andrewlebon  India
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Default FINALLY WORKING

Hi
greetings can anyone guide me as its only my second sucessful d class amp
at last managed to make amp work outputs are IRF250N my supply is 50 volts
dc amp is sounding clear and powerful in 4 ohms load only problem is my output inductor after testing about 20 different cores finally managed to get cores which are luke warm on high volume testing on trying different cores of same
material with more and less turns sound quality changes more treble another core more bass how do i know which is best output inductor for me i cant get
t106_2 core here so i cant really tell what core will sound best can any one suggest where i can order t106_2 prewound 33uh inductor
warm regards
andrew lebon
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Old 8th February 2012, 09:59 AM   #1617
Whortless is offline Whortless  Turkey
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Quote:
Originally Posted by andrewlebon View Post
Hi
greetings can anyone guide me as its only my second sucessful d class amp
at last managed to make amp work outputs are IRF250N my supply is 50 volts
dc amp is sounding clear and powerful in 4 ohms load only problem is my output inductor after testing about 20 different cores finally managed to get cores which are luke warm on high volume testing on trying different cores of same
material with more and less turns sound quality changes more treble another core more bass how do i know which is best output inductor for me i cant get
t106_2 core here so i cant really tell what core will sound best can any one suggest where i can order t106_2 prewound 33uh inductor
warm regards
andrew lebon
Hi,
There is something wrong in your application. This is not an ordinary ClassAB amp. Therefore you must not use wires from PCB to output mosfets. First correct this and mount the mosfets directly to PCB and then try your different output inductors again. There should be some difference. It is very difficult to say which inductor is best without any measured result.

BR
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Old 8th February 2012, 11:33 AM   #1618
andrewlebon is offline andrewlebon  India
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Default THANKS FOR REPLYING

Hi Whortless
greetings thanks for replying wires are for testing all suitable mosfets available with me till i get my IRFB4227 MOSFETS
warm regards
andrew lebon
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Old 8th February 2012, 12:18 PM   #1619
Dimonis is offline Dimonis  Russian Federation
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Quote:
Originally Posted by andrewlebon View Post
Hi
greetings can anyone guide me as its only my second sucessful d class amp
at last managed to make amp work outputs are IRF250N my supply is 50 volts
dc amp is sounding clear and powerful in 4 ohms load only problem is my output inductor after testing about 20 different cores finally managed to get cores which are luke warm on high volume testing on trying different cores of same
material with more and less turns sound quality changes more treble another core more bass how do i know which is best output inductor for me i cant get
t106_2 core here so i cant really tell what core will sound best can any one suggest where i can order t106_2 prewound 33uh inductor
warm regards
andrew lebon
The cores that i see at your foto seem to be ferrite?
It's not good to make inductors on ungapped ferrite.
You can make a gap in a Ring-core with a grinder , some thing about ~3mm . So it woudn't saturate.
Like this
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Last edited by Dimonis; 8th February 2012 at 12:37 PM.
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Old 9th February 2012, 08:52 PM   #1620
stewin is offline stewin  Kenya
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Quote:
Originally Posted by andrewlebon View Post
Hi
greetings can anyone guide me as its only my second sucessful d class amp
at last managed to make amp work outputs are IRF250N my supply is 50 volts
dc amp is sounding clear and powerful in 4 ohms load only problem is my output inductor after testing about 20 different cores finally managed to get cores which are luke warm on high volume testing on trying different cores of same
material with more and less turns sound quality changes more treble another core more bass how do i know which is best output inductor for me i cant get
t106_2 core here so i cant really tell what core will sound best can any one suggest where i can order t106_2 prewound 33uh inductor
warm regards
andrew lebon
congrats andrew finaly you have it working. try to get e cores from old pc power supply and boil them in hot water . after separating them coil 30 turns and make sure you add 1mm gap using a tiny piece of old cd or dvd disc. BTW cool car stereo sony gt490

sad for me after like 4 months of my amp working it failed but i think it is tip 41 which supplies 12vlts to ir2110 which failed and caused the whole thing to collapse i was using 24ohms 3speakers each 8ohm speakers in series .

Last edited by stewin; 9th February 2012 at 09:08 PM.
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