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Old 22nd March 2007, 08:28 PM   #1
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Default D AMP is back !!!

Hi everyone,

D amp Proto is running fine !

Dead time adjustments made...sound is great !

here are some pics of the proto:

post filter output voltage ripple 4Vpp@ 250kHz

no shoot through anymore ;-)

thanks Fredos
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Old 22nd March 2007, 08:32 PM   #2
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another one of the proto :
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Old 22nd March 2007, 08:33 PM   #3
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and i forgot
output DC offset : 18mV
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Old 22nd March 2007, 09:50 PM   #4
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WOW!!
Super!
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Old 23rd March 2007, 06:37 PM   #5
fredos is offline fredos  Canada
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Nice!

Fredos
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Old 23rd March 2007, 08:06 PM   #6
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Hi everyone

just a little question for Fredos

with no load, the amp has sometimes trouble to start...
maybe because of the feedback loop : loudspeaker is part of the output filter ;-)

I think it's normal (amp with no load isn't a usual way to do !!)
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Old 23rd March 2007, 08:15 PM   #7
zilog is offline zilog  Sweden
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How do you take care of the gate voltage supply for the high side FET? Maybe your schematic requires grounding through the load in order to transfer charge to this supply.
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Old 23rd March 2007, 11:33 PM   #8
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Hi Zilog,

Supply of the upper fet is made by bootstrap diode and capacitor through the load you're right !
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Old 24th March 2007, 06:01 AM   #9
luka is offline luka  Slovenia
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Hi

Isn't 4Vpp at 250kHz a bit too much? Is this because of series resistance of filter cap in output filter?
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Old 24th March 2007, 08:53 AM   #10
luka is offline luka  Slovenia
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Hi

And what is your supply DC voltage when the amp is idle on what when at full power?
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