you can try this -- sans some of the necessary bells and whistles -- you will have to determine the values of resistors for the bias generator, etc -- based on a thought by Borbley:
An externally hosted image should be here but it was not working when we last tested it.
steven344 said:
Nice idea.
LM4702 is hivolt hifi audio amplifier driver.
It has got 2 outputs:
- one inverting
- one non-inverting
It was originally made to control a complementary Bipolar Follower stage
and has got a VBE-multiplier function
You may have noticed this National Application note Topic ( a bit later )
by peranders
Super class A or......
http://www.diyaudio.com/forums/showthread.php?threadid=125691
National has done an investigation/circuit and using LM4702 to drive
MOSFETs like:
IRF240/9240, 2SK1058/2SK162 etc.
See my attachment for the circuit idea, schematic
==========================
Litterature/links for further reading and thinking are here:
LM4702 - Stereo High Fidelity 200 Volt Driver
http://www.national.com/pf/LM/LM4702.html
AN-1645: Application Note 1645 LM4702 Driving a MOSFET Output Stage
http://www.national.com/an/AN/AN-1645.pdf
AN-1490: Application Note 1490 LM4702 Power Amplifier
http://www.national.com/an/AN/AN-1490.pdf
Past Classical LM4702 topics and projects in Chip Amps forum:
http://www.diyaudio.com/forums/showthread.php?threadid=66593
http://www.diyaudio.com/forums/showthread.php?threadid=65421
... and
Something with LM4702 and Power FET ( FastEddy December 2006 )
http://www.diyaudio.com/forums/showthread.php?threadid=92250
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