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Class D Switching Power Amplifiers and Power D/A conversion

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Old 14th June 2008, 08:28 AM   #131
Pafi is offline Pafi  Hungary
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Quote:
Originally posted by phase_accurate
Take care about what PSU that you use for that test !
Why?
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Old 14th June 2008, 09:19 AM   #132
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Evil answer: Try it and you'll see !!!

Nice answer: Because of supply pumping effect !

Regards

Charles
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Old 14th June 2008, 09:52 AM   #133
Pafi is offline Pafi  Hungary
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Evil answer: think it over!

Nice answer: in this case supply pumping is cancelled by load current, because load current flows from the pumped side of the supply. +10 A load current causes 5 A pumping in negative side, but the 10 A goes thru the load, and landed on negative side, so effective supply current is 5 A in normal direction on both side.
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Old 14th June 2008, 11:28 AM   #134
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Didn't expect that one to be a bridged type amp !!!!

Regards

Charles
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Old 14th June 2008, 08:54 PM   #135
Pafi is offline Pafi  Hungary
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Not bridged.

Try it, and you'll see!

Think! There is no load connected to GND. How could supply currents be different? This way the amp is a basic step-down converter.
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Old 15th June 2008, 06:18 AM   #136
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Ahhhhh !!! I didn't get that they want to connect the load between output and supply rail. In this case of course it doesn't matter.

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Charles
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