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Chip Amps Amplifiers based on integrated circuits

Crazy MOSFET Mayhem
Crazy MOSFET Mayhem
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Old 13th October 2011, 07:25 PM   #1
palstanturhin is offline palstanturhin  Finland
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Default Crazy MOSFET Mayhem

What do you think?

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Got the idea from the SMPS i am building...
All N-channel mosfets. Should be pretty easy to match.
Of course bias stage and thermal tracking would be nice...
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Old 14th October 2011, 10:12 AM   #2
palstanturhin is offline palstanturhin  Finland
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...and the PWM control... ;-)
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Old 15th October 2011, 12:31 AM   #3
Francec is offline Francec  Australia
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Two things;
this is the chip amp forum
since no components are labeled, who would know what the circuit is or does?
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Old 15th October 2011, 12:45 AM   #4
kenpeter is offline kenpeter  United States
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All N-Ch necessitates bigger voltage swing
source follower gates than drain followers.
You can't just cross the drives as drawn...

Top two BJTs are miswired and won't work.
Will short circuit from + to minus as a pair
of forward biased diodes...

Gate drive transformers might be a quick fix.

Last edited by kenpeter; 15th October 2011 at 12:47 AM.
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Old 15th October 2011, 02:45 AM   #5
gootee is offline gootee  United States
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You would probably want to put the power-booster INSIDE the feedback loop.

Take a look at these cool application notes!

http://www.national.com/an/AN/AN-272.pdf

http://cds.linear.com/docs/Application%20Note/an18f.pdf

http://www.cirrus.com/en/pubs/appNote/Apex_AN14U_C.pdf
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Old 17th October 2011, 09:14 AM   #6
palstanturhin is offline palstanturhin  Finland
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Everyone is absolutely right!

I soon realised, this will not work...
Good i did not make a prototype yet! :-)
The BJTs are wrong...

And it must be made class-AD to make it work...
And therefore i am in the wrong forum!!! ;-)

PS: My SMPS is working great though... I will post my schematic to the PowerSupply forum later...
Simple and easy! No special components needed.
And crazy powerfull!!! I.E. the REAL Mosfet Mayhem...

Thanks all!
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