MOSFET IRFP240 Output using LME49830 driver chip - diyAudio
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Old 29th July 2008, 06:05 PM   #1
lineup is offline lineup  Sweden
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Arrow MOSFET IRFP240 Output using LME49830 driver chip



I will make my circuit suggestion how to use the LME49830 mosfet driver.
I want to keep this amplifier easy to build.
So, will be simple & good

My starting point is the typical example from this Application Note
by National Semiconductors laboratory workers and designers.
http://www.national.com/an/AN/AN-1850.pdf


Here we go.
Your own suggestions & corrections are very welcome, as my work will progress.

I will start with Version 1a, using these:
Quote:
> IRFP240 N-Channel Fet V-MOS,200V,20A,150W,<0,18Ohm(12A)
> IRFP9240 P-Channel Fet V-MOS,200V,12A,150W,<0,5Ohm(7,2A)
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Old 29th July 2008, 06:08 PM   #2
lineup is offline lineup  Sweden
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Default The Basic start Schematic

here is attached
the basic circuit recommended by National

I will add components after doing research using my Professional Spice Simulator.
This will be my main tool to evaluate, initially.
You may do the same, if you know & have a spice sim.
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File Type: png lme49830_basic_1a.png (6.4 KB, 1051 views)
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Old 30th July 2008, 09:17 AM   #3
AndrewT is offline AndrewT  Scotland
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Hi Lineup,
have you considered using 9140 and 240 as a nearly matched pair?
Limits the supply to +-50V, but can still give adequate power
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Old 30th July 2008, 11:00 PM   #4
lineup is offline lineup  Sweden
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AndrewT
240 and 9140
Are they known to good match complementary ?
I know sometimes best choice does not follow numbers.
Something about Rds match maybe ?

If you give a reason and some detail, Andrew, I'll look into this

Regards
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Old 31st July 2008, 08:06 AM   #5
AndrewT is offline AndrewT  Scotland
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some amp builders on this Forum recommend 240/9140 combination.
Ampguru offers his amps with this as the low voltage option.
It appears that the 9240 is a poor complement to it's numerical partner and this is a very common problem with most vFETs.
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Old 31st July 2008, 09:43 AM   #6
lineup is offline lineup  Sweden
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yes
I know.
This case is not the only.
I will try amplifierguru suggestion: 240/9140.
I think he knows better than me.
He is good!
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