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-   -   LME 49811 Project? (http://www.diyaudio.com/forums/chip-amps/123911-lme-49811-project.html)

jaya000 28th May 2008 06:48 PM

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.

Shaun 29th May 2008 06:45 AM

Here's one idea...

peranders 29th May 2008 06:56 AM

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

Shaun 4th September 2008 06:52 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 11:28 AM

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 11:47 AM

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 05:01 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 12:16 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:

http://www.tech-diy.com/Amplifiers/L...PCB_Sanken.gif

and a 3D image:

http://www.tech-diy.com/Amplifiers/L..._Sanken_3D.gif

jaya000 8th April 2009 05:34 AM

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

Shaun 9th April 2009 07:46 AM

@ jackinnj:

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


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