Please critique my PCB design - Page 2

EnvisionAudio · 16th April 2008, 11:02 PM

Quote:

Originally posted by darkfenriz
I've got only top and bottom in "light" edition

Unless they changed something...you have TRestrict in Light (layer 41). The polygon feature is there, too. Light only restricts you to two signal layers - you can have as many mechanical layers as you want!

DJ Exprice · 17th April 2008, 08:53 PM

May we see the EAGLE files please?

Having the EAGLE files will allow us to have a better understanding of the layout.

Thanks,

vb

darkfenriz · 18th April 2008, 07:22 AM

ok

darkfenriz · 18th April 2008, 03:13 PM

Started experimenting a little bit...

darkfenriz · 18th April 2008, 03:14 PM

continued

darkfenriz · 18th April 2008, 03:21 PM

Waveforms after dead time generator (ir2110 inputs) driven by low level sine. Dead time set to maximum, around 120ns.
Little overshooting and jittery, but still with nice slopes, so I don't think it is much a problem.

Regards
Adam

Eva · 18th April 2008, 04:57 PM

Remember that a good old 100Mhz CRT analog oscilloscope will tell you more truth about class D switching waveforms...

zilog · 20th April 2008, 07:22 AM

Quote:

Originally posted by Eva
Remember that a good old 100Mhz CRT analog oscilloscope will tell you more truth about class D switching waveforms...

I have thought about upgrading myself to some kind of DSO, what are the pros and cons when it comes to class d and smps?

Pafi · 20th April 2008, 08:04 AM

darkfenriz!

It's not about PCB, but why do you use 2 RC delay network and 2 potentiometers?

darkfenriz · 20th April 2008, 10:08 AM

I was not sure about symmetry of the dead time, so I can adjust it separately for high side and low side dead time.
Probably I was over-worried about that, one RC should be OK.

Regards
Adam

P.S. another issue is I had six inverters in one package, so why not?

18th April 2008, 04:57 PM	#17
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	Remember that a good old 100Mhz CRT analog oscilloscope will tell you more truth about class D switching waveforms... __________________ I use to feel like the small child in The Emperor's New Clothes tale

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17th April 2008, 08:53 PM	#12
DJ Exprice diyAudio Member Join Date: Mar 2006 Location: San Francisco, California	May we see the EAGLE files please? Having the EAGLE files will allow us to have a better understanding of the layout. Thanks, vb

20th April 2008, 08:04 AM	#19
Pafi diyAudio Member Join Date: May 2004 Location: Budapest	darkfenriz! It's not about PCB, but why do you use 2 RC delay network and 2 potentiometers?

20th April 2008, 10:08 AM	#20
darkfenriz diyAudio Member Join Date: Jun 2004 Location: Warsaw	I was not sure about symmetry of the dead time, so I can adjust it separately for high side and low side dead time. Probably I was over-worried about that, one RC should be OK. Regards Adam P.S. another issue is I had six inverters in one package, so why not?