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Old 28th February 2009, 09:06 PM   #1
packer is offline packer  United Kingdom
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Default What is this Amp design called?

I have an FBT MAXX 4a powerd speaker which keeps blowing FETS (Q3). See page 3. I have never seen this design before.
especially passing audio through digital Gates See pre amp section.

I would like to know what the design is called and then search for some theory on operation. Also I would like to know what voltages to expect at each junction.

Even with a lamp in series with the ac in it shorts Q3, D5 & U2

The circuit was too big to Upload so link below

SCHEMATIC DOWNLOAD

All help would be be most appreciated.
 
Old 28th February 2009, 10:13 PM   #2
infinia is offline infinia  United States
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Hi
It looks like a Class D amplifier output stage.
It's basically a pulse width modulated power switch with a low pass filter.
U2 is a MOSFET driver with high side and low side gate drive.


Check Q4 and for any low impedance on outputs.
If OK, check with O-scope after disconnecting the 60V drain supply.
EDIT>If the otherside is working, use it for a reference.

Cheers
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Old 1st March 2009, 12:11 AM   #3
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Mission accomplished, thread closed as requested.
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