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Old 28th May 2008, 07:48 PM   #1
jaya000 is offline jaya000  India
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Default 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.
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Old 29th May 2008, 07:45 AM   #2
Shaun is offline Shaun  South Africa
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Here's one idea...
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Old 29th May 2008, 07:56 AM   #3
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National's LMExxxxx series isquite new. That might be the reason.
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Old 4th September 2008, 07:52 AM   #4
Shaun is offline Shaun  South Africa
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I have these chips and some transistors, and I'm in the planning stages of cobbling together an amp of similar output power.
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Old 4th September 2008, 12:28 PM   #5
proset is offline proset  Spain
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I was using lme49811 as a driver for a 70 W class A MosFET power amplifier, and it work very well.
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Old 4th September 2008, 12:47 PM   #6
Shaun is offline Shaun  South Africa
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It seems that most DIY applications use MOSFET output stages. I have some bipolars already, so I'm committed to using those.
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Old 4th September 2008, 06:01 PM   #7
proset is offline proset  Spain
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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.
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Old 7th April 2009, 01:16 PM   #8
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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:

Click the image to open in full size.

and a 3D image:

Click the image to open in full size.
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Old 8th April 2009, 06:34 AM   #9
jaya000 is offline jaya000  India
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Excellent picture & drawing jackinnj!
Congratulations!
Waiting for ur test results.
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Old 9th April 2009, 08:46 AM   #10
Shaun is offline Shaun  South Africa
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@ jackinnj:

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