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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 31st May 2019, 06:54 AM   #11
badboy6120 is offline badboy6120  Malaysia
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Here's the latest schematic:
New 2.png - Google Drive
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Old 31st May 2019, 07:00 AM   #12
thimios is offline thimios  Greece
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Quote:
Originally Posted by badboy6120 View Post
Here's the latest schematic:
New 2.png - Google Drive
Can you post the pcb?
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Old 31st May 2019, 07:33 AM   #13
manojtm is offline manojtm  India
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Hi,
Thanks
Quote:
now the problem is that I can not get more than 600W rms out of this amp on a 4 ohms load despite using a +-90 volts supply
(I get about 70 volts peak output and after that clipping start. at clipping point I have about +-84V on amp rails)
90v supply rail you will get more than 600W. you said you get 70v on output at 4R load. it means you get more than 1000W

for higher voltage you need to set FB resistor to get 29dB~32dB Max. gain

Regards
MANOJ
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Old 31st May 2019, 07:43 AM   #14
badboy6120 is offline badboy6120  Malaysia
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Quote:
Originally Posted by thimios View Post
Can you post the pcb?
i'm still using manojtm pcb design V. 01(two seperate pcb)
you can find it here:
ucd 25 watts to 1200 watts using 2 mosfets
posted by Dear MANOJ
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Old 31st May 2019, 07:52 AM   #15
badboy6120 is offline badboy6120  Malaysia
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Quote:
Originally Posted by manojtm View Post
Hi,
Thanks


90v supply rail you will get more than 600W. you said you get 70v on output at 4R load. it means you get more than 1000W

for higher voltage you need to set FB resistor to get 29dB~32dB Max. gain

Regards
MANOJ
Hi dear MANOJ

I want to build two separate amp that each capable of delivering 800W rms @4 ohms load for my subwoofers
right now I get 70V peak output voltages that is about 50V rms that deliver about 625W rms @ 4 ohms

I know that for 800W @4ohms I only nead +-80 volts but to lower my SMPS output voltage I have to reduce 1 turn of each secondary winding that will cause to reduce the voltages below +-80 Volts
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Old 31st May 2019, 07:54 AM   #16
badboy6120 is offline badboy6120  Malaysia
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Quote:
for higher voltage you need to set FB resistor to get 29dB~32dB Max. gain
Can you help me with that?
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Old 31st May 2019, 08:20 AM   #17
manojtm is offline manojtm  India
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File Type: jpg New 2.jpg (598.1 KB, 270 views)
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Old 31st May 2019, 08:32 AM   #18
manojtm is offline manojtm  India
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Hi,
for L use T157-2 core 1.5mm wire 49T (22uH)
High Volt(85v) use 47K (68K),56pF(100pF), 4K7/3W(2K2/3w) and add limiter circuit to avoid clip

Regards
MANOJ

Last edited by manojtm; 31st May 2019 at 08:38 AM.
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Old 31st May 2019, 08:46 AM   #19
badboy6120 is offline badboy6120  Malaysia
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Quote:
Originally Posted by manojtm View Post
Hi,
for L use T157-2 core 1.5mm wire 49T (22uH)
High Volt(85v) use 47K (68K),56pF(100pF), 4K7/3W(2K2/3w) and add limiter circuit to avoid clip

Regards
MANOJ
I don't have T157-2 at the moment and only etd 39 & etd49 & T106-2
I will buy it then if above core doesn't do the job
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Old 31st May 2019, 09:04 AM   #20
badboy6120 is offline badboy6120  Malaysia
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I don't know why but I get about 185KH frequency with 1K resistor and 135KH with 560 ohms resistor
with 1k resistor:
IMG_20190531_132441.jpg - Google Drive

with 560 ohms:
IMG_20190531_132213.jpg - Google Drive

Time/Div is set to 2us

Ps: the measurements is from before the L(mosfets output) and GND
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