JLH class a with a SMPS?? Possible?

DJNUBZ · 26th March 2005, 10:06 PM

I'm just curious if it would be possible to build an amp like this with a SMPS so it could run off of 12-14V?

weinstro · 27th March 2005, 04:26 AM

Sure, why not?

If anything, the SMPS should work better under this condition since the load seen by the PS will be constant.

I like the ultra low noise chips available from Linear Technology, e.g., LT1680, LT1533, etc. See http://www.linear-tech.com/index.jsp. Their app notes are good, and a recommended read. They can be run open loop or closed loop.

Specific problems you'll have to address are magnetics design, radiated noise, and heat dissipation. Pick a switching frequency well above audio range to avoid mechanical and electrical noise in the audio band.

If you intend to run this in an automobile, you'll have to pay more attention to heat management, since space is a premium. Also, you'll need to widen the operating voltages to 8-45 Vdc. Your design should be able to at least survive this, plus maybe reverse polarity.

Regards,

Rob

weinstro · 27th March 2005, 04:47 PM

When you're ready to tackle the magnetics portion of your power supply, I'd recommend checking out the website of Magnetics, Inc.

http://www.mag-inc.com/

Very good documentation available.

Regards,

Rob

26th March 2005, 10:06 PM	#1
DJNUBZ diyAudio Member Join Date: May 2003 Location: Chicago	JLH class a with a SMPS?? Possible? I'm just curious if it would be possible to build an amp like this with a SMPS so it could run off of 12-14V? __________________ My 3d printing startup, need something printed? Car Audio Connoisseur

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27th March 2005, 04:26 AM	#2
weinstro diyAudio Member Join Date: May 2003	Sure, why not? If anything, the SMPS should work better under this condition since the load seen by the PS will be constant. I like the ultra low noise chips available from Linear Technology, e.g., LT1680, LT1533, etc. See http://www.linear-tech.com/index.jsp. Their app notes are good, and a recommended read. They can be run open loop or closed loop. Specific problems you'll have to address are magnetics design, radiated noise, and heat dissipation. Pick a switching frequency well above audio range to avoid mechanical and electrical noise in the audio band. If you intend to run this in an automobile, you'll have to pay more attention to heat management, since space is a premium. Also, you'll need to widen the operating voltages to 8-45 Vdc. Your design should be able to at least survive this, plus maybe reverse polarity. Regards, Rob

27th March 2005, 04:47 PM	#3
weinstro diyAudio Member Join Date: May 2003	When you're ready to tackle the magnetics portion of your power supply, I'd recommend checking out the website of Magnetics, Inc. http://www.mag-inc.com/ Very good documentation available. Regards, Rob