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Class D Switching Power Amplifiers and Power D/A conversion

600W Class D amp
600W Class D amp
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Old 6th July 2019, 04:27 PM   #91
AudioSan is offline AudioSan  Norway
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is there a reason for this posting?
you don't need te teach me about peak and rms. but you need to stop mixing them.
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Old 6th July 2019, 08:27 PM   #92
badboy6120 is offline badboy6120  Malaysia
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Thank you dear monaj for your helps
here's the latest schematic
any problem?
AUD600.Ver.2.jpg - Google Drive
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Old 7th July 2019, 05:46 AM   #93
manojtm is offline manojtm  India
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Hi,

ok. only thing you can increase resistor value (3K3/5W) to 8K8/2W.a good quality op-amp will consume less current. from 90v 8k8 can give 10mA TL071&72 will consume only 2.5mA Max. so both will take 5mA.

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Old 7th July 2019, 06:17 AM   #94
manojtm is offline manojtm  India
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Hi,
badboy6120 only for you,
please measure output volt without any load on current configuration.

a) +/-85v supply rail 100Hz pure sine wave 1.4vpp signal
b) +/-85v supply rail 1000Hz pure sine wave 1.4vpp signal

Regards
MANOJ
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Old 7th July 2019, 07:28 AM   #95
badboy6120 is offline badboy6120  Malaysia
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Quote:
Originally Posted by manojtm View Post
Hi,
badboy6120 only for you,
please measure output volt without any load on current configuration.

a) +/-85v supply rail 100Hz pure sine wave 1.4vpp signal
b) +/-85v supply rail 1000Hz pure sine wave 1.4vpp signal

Regards
MANOJ
Hi sir monaj
thanks alot for helping
I will do that tonight and share the result but without any load the rail voltages goes to +-90V and 85V is when the amp is under heavy load
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Old 7th July 2019, 07:51 PM   #96
badboy6120 is offline badboy6120  Malaysia
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Quote:
Originally Posted by manojtm View Post
Hi,
badboy6120 only for you,
please measure output volt without any load on current configuration.

a) +/-85v supply rail 100Hz pure sine wave 1.4vpp signal
b) +/-85v supply rail 1000Hz pure sine wave 1.4vpp signal

Regards
MANOJ
with +-90V supply and feeding a 1.4V peak to peak sine wave I get about 108V peak to peak with 100Hz and 1khz(without any load)
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Last edited by badboy6120; 7th July 2019 at 08:02 PM.
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Old 10th July 2019, 09:53 PM   #97
badboy6120 is offline badboy6120  Malaysia
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Good News
I increased the rail voltages to +-110V and now I could get more than 1100W RMS output power
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Old 11th July 2019, 07:59 PM   #98
badboy6120 is offline badboy6120  Malaysia
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Hey guys
What's the best solution to reduce mosfets overheating?
parralleling mosfets?
or go for full bridge?
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Old 13th July 2019, 06:15 AM   #99
badboy6120 is offline badboy6120  Malaysia
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I manage to controll the mosfet overheating by using seperate heatsink for mosfets and remove the isolator between mosfets and heatsink
I test this amp for more than an hour with more than 1KW rms in output by 100HZ sine wave
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Old 17th July 2019, 08:04 PM   #100
badboy6120 is offline badboy6120  Malaysia
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Hey guys
I was wondering if the new supply votages(+-110V) will cause any damage to the mosfets (BVDSS)
my mosfets are 4IRFP4227
I test this amp with more than 1KW RMS output for an Hour but I don't want to damage the mosfet because of the drain source breakdown voltage
any help would be appriciated
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