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-   -   Any spice models for the LM3886 ? (http://www.diyaudio.com/forums/chip-amps/146652-any-spice-models-lm3886.html)

gaetan8888 29th June 2009 01:10 AM

Any spice models for the LM3886 ?
 
Hello

Is there any reliable spice models for the LM3886 ?

Thank you

Bye

Gaetan

pacificblue 29th June 2009 02:00 PM

http://www.ssguitar.com/index.php?topic=452.msg3250

gaetan8888 29th June 2009 03:06 PM

Hello

Did you try it, how good is that model ?

Thank you

Bye

Gaetan

Ted205 29th June 2009 03:19 PM

how would you go about adding something like that to multisim ?

pacificblue 29th June 2009 08:35 PM

Quote:

Originally posted by gaetan8888
how good is that model ?
How good do you want it to be? Which aspect is important for the simulation you want to do?

It is basically a copy of the equivalent schematic from the datasheet with a reasonable guess at the current sources. The semiconductors are the standard models, as can be expected, when a model is not from the manufacturer.

What it does:
- The current limiter works, but the thresholds do not seem to be realistic.
- The same goes for the undervoltage protection and the clipping protection.
- The mute pin works, although it needs 1 mA to activate the amp fully as opposed to the 0,5 mA specified in the datasheet.
- It allows you to simulate the filters around the amplifier and the feedback loop's function.

What it does not:
- Show reliable THD results.
- Allow for thermal simulation.
- Simulate the entire functionality of the SPiKe protection system.
- Work on all realistic conditions. Some combinations of values make the simulation very slow or end with an error message.

gaetan8888 29th June 2009 10:03 PM

Hello pacificblue

Thank for your explanation.

Bye

Gaetan


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