[Contribution] Super Cheap 100W class D , PCB Ready

[norazmi]

Here some contribution from me, simple class D and has been simulate with LTSpice with lowest THD 0.11 %.

Input Vrms 1.7v. Pow at output 24.4V 8 ampere. Power Rails +/- 45 VDC and +/- 50VDC is the max.
mosfet use is IRF540N and IRF9540. Fsw approx 354 Khz.

- Low noise while using comparator LM311 has been Improve.
- OpAmp added For better sound quality.
- Low Thd has been Improve 0.11%.
- Input gain has been Increase.

Direct Newton iteration for .op point succeeded.
Fourier components of V(out)
DC component:0.023729

Harmonic Frequency Fourier Normalized Phase Normalized
Number [Hz] Component Component [degree] Phase [deg]
1 1.000e+02 1.097e+01 1.000e+00 -0.07° 0.00°
2 2.000e+02 8.637e-03 7.871e-04 -89.47° -89.40°
3 3.000e+02 4.580e-03 4.174e-04 -179.17° -179.10°
4 4.000e+02 2.230e-03 2.032e-04 -89.63° -89.56°
5 5.000e+02 3.487e-03 3.178e-04 -177.64° -177.57°
6 6.000e+02 1.984e-03 1.808e-04 -87.95° -87.88°
7 7.000e+02 2.196e-03 2.001e-04 -176.83° -176.76°
8 8.000e+02 1.434e-03 1.307e-04 -90.19° -90.12°
9 9.000e+02 1.243e-03 1.133e-04 -176.27° -176.20°
Total Harmonic Distortion: 0.101914%



Date: Sat Feb 18 23:55:32 2011
Total elapsed time: 483.297 seconds.

tnom = 27
temp = 27
method = modified trap
totiter = 5949112
traniter = 5949078
tranpoints = 1332273
accept = 935515
rejected = 396758
matrix size = 72
fillins = 135
solver = Normal
Matrix Compiler1: 11.4 KB object code size 11.8/8.8/[4.3]
Matrix Compiler2: off [5.6]/7.3/165.0

 

[norazmi]

Will post schema & pcb tonight

 

[stewin]

is it stable at 2 ohms

 

[norazmi]

i`ll try simulate with 2 ohm and let u know about mosfet heating. But i think the rails voltage should be lower to +/- 35vdc. So far very stable with 4 ohm and i do test it in reality no problem. i can make a test later with 2 ohm load, i need to find speaker first to test with. and it must be hi power speaker so we can know how fast mosfet heat.

 

[norazmi]

This is toner, top and silk screen, i`ll try to post in pdf later but u can resize it, original dimension is 11cm x 6 cm.

 

[norazmi]

here is the another pic, its same but i upload it at private website maybe can be more clear.

regards.

 

[wolfshark]

Hi norazmi! Do you have the shematics with your modifications? It will be great if you post them too. This will be my first Class D amp and i want to make your design.

 

[norazmi]

yes I still have it all, I'll upload it later

 

[pravpa]

yes I still have it all, I'll upload it later

Hi Norazmi...Hope you are Feeling Well now..Yes, after a long "No" a Too long Time you are back..Take Care..
Super Cheap 100W class D , PCB Ready ?????

 

[norazmi]

yes you can refer above

 

[pravpa]

yes you can refer above

Yes, I saw it. it does not appear in exact size. You would not mind to share it in PDF.