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Chip Amps Amplifiers based on integrated circuits

lm4702 with complementry mosfet output
lm4702 with complementry mosfet output
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Old 3rd January 2007, 06:05 PM   #1
steven344 is offline steven344  United States
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Default lm4702 with complementry mosfet output

Just trying out using mosfets with the lm 4702
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Old 10th February 2007, 01:04 PM   #2
rapunzelelch is offline rapunzelelch  Germany
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hallo Steven
why do you put the n channel down to minus and the p channel to plus?
greetings rapunzelelch
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Old 10th February 2007, 02:36 PM   #3
jackinnj is offline jackinnj  United States
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lm4702 with complementry mosfet output
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:

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Old 1st July 2008, 11:07 AM   #4
lineup is offline lineup  Sweden
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Default Re: lm4702 with complementry mosfet output

Originally posted by steven344
Just trying out using mosfets with the lm 4702
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It was originally made to control a complementary Bipolar Follower stage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......
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
AN-1645: Application Note 1645 LM4702 Driving a MOSFET Output Stage
AN-1490: Application Note 1490 LM4702 Power Amplifier

Past Classical LM4702 topics and projects in Chip Amps forum:
... and
Something with LM4702 and Power FET ( FastEddy December 2006 )

Lineup regars
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