LME 49811 Project?

jaya000 · 28th May 2008, 07:48 PM

The new driver ic LME49811 from National looks very nice.
But i can't see here that any body hv used it.
How about making some amplifier design of 300W~500W @ 4 ohms from this?
Suggestions & guidance is welcome.

Shaun · 29th May 2008, 07:45 AM

Here's one idea...

peranders · 29th May 2008, 07:56 AM

National's LMExxxxx series isquite new. That might be the reason.

Shaun · 4th September 2008, 07:52 AM

I have these chips and some transistors, and I'm in the planning stages of cobbling together an amp of similar output power.

proset · 4th September 2008, 12:28 PM

I was using lme49811 as a driver for a 70 W class A MosFET power amplifier, and it work very well.

Shaun · 4th September 2008, 12:47 PM

It seems that most DIY applications use MOSFET output stages. I have some bipolars already, so I'm committed to using those.

proset · 4th September 2008, 06:01 PM

If you plan to use BJT , probably you will need a current driver stage to increase the limited current of lme 49811 (9ma) to higher levels.

jackinnj · 7th April 2009, 01:16 PM

Here's an LME49811 Project which I sent out to the proto-house yesterday afternoon -- I was really thrilled at the results of an amp build with the LM4702 and the Sanken STD03N and STD03P -- self compensating Darlingtons -- but the LM4702 topology isn't quite as "adaptable" as the single LME49811. The Sanken's were very stable:

I used the noise-gain comp circuit -- we will see how this works compared to the originally recommended cap between the COMP and SINK pins:

and a 3D image:

jaya000 · 8th April 2009, 06:34 AM

Excellent picture & drawing jackinnj!
Congratulations!
Waiting for ur test results.

Shaun · 9th April 2009, 08:46 AM

@ jackinnj:

What software did you use to do that 3-D rendering?

28th May 2008, 07:48 PM	#1
jaya000 diyAudio Member Join Date: Dec 2006	LME 49811 Project? The new driver ic LME49811 from National looks very nice. But i can't see here that any body hv used it. How about making some amplifier design of 300W~500W @ 4 ohms from this? Suggestions & guidance is welcome.

29th May 2008, 07:45 AM	#2
Shaun diyAudio Member Join Date: Aug 2001 Location: Cape Town, South Africa	Here's one idea... __________________ Shaun Onverwacht \|\|\|\|\|\|\|\|\|\| DON'T PANIC \|\|\|\|\|\|\|\|\|\|

29th May 2008, 07:56 AM	#3
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	National's LMExxxxx series isquite new. That might be the reason. __________________ /Per-Anders (my first name) or P-A as my friends call me

4th September 2008, 07:52 AM	#4
Shaun diyAudio Member Join Date: Aug 2001 Location: Cape Town, South Africa	I have these chips and some transistors, and I'm in the planning stages of cobbling together an amp of similar output power. __________________ Shaun Onverwacht \|\|\|\|\|\|\|\|\|\| DON'T PANIC \|\|\|\|\|\|\|\|\|\|

4th September 2008, 12:47 PM	#6
Shaun diyAudio Member Join Date: Aug 2001 Location: Cape Town, South Africa	It seems that most DIY applications use MOSFET output stages. I have some bipolars already, so I'm committed to using those. __________________ Shaun Onverwacht \|\|\|\|\|\|\|\|\|\| DON'T PANIC \|\|\|\|\|\|\|\|\|\|


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4th September 2008, 12:28 PM	#5
proset diyAudio Member Join Date: Aug 2004 Location: barcelona	I was using lme49811 as a driver for a 70 W class A MosFET power amplifier, and it work very well.

4th September 2008, 06:01 PM	#7
proset diyAudio Member Join Date: Aug 2004 Location: barcelona	If you plan to use BJT , probably you will need a current driver stage to increase the limited current of lme 49811 (9ma) to higher levels.

7th April 2009, 01:16 PM	#8
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	Here's an LME49811 Project which I sent out to the proto-house yesterday afternoon -- I was really thrilled at the results of an amp build with the LM4702 and the Sanken STD03N and STD03P -- self compensating Darlingtons -- but the LM4702 topology isn't quite as "adaptable" as the single LME49811. The Sanken's were very stable: I used the noise-gain comp circuit -- we will see how this works compared to the originally recommended cap between the COMP and SINK pins: and a 3D image:

8th April 2009, 06:34 AM	#9
jaya000 diyAudio Member Join Date: Dec 2006	Excellent picture & drawing jackinnj! Congratulations! Waiting for ur test results.

9th April 2009, 08:46 AM	#10
Shaun diyAudio Member Join Date: Aug 2001 Location: Cape Town, South Africa	@ jackinnj: What software did you use to do that 3-D rendering? __________________ Shaun Onverwacht \|\|\|\|\|\|\|\|\|\| DON'T PANIC \|\|\|\|\|\|\|\|\|\|

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