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Old 28th December 2004, 03:09 PM   #1
maylar is offline maylar  United States
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Default chip amp idle current

How much power do MOSFET chip amps draw with no load? I'm talking about the bridged circuits that get used in typical car stereo's (14 v supply).

Some head units get mighty hot when running a full set of 4 speakers. I'm curious how much heat would be generated if the speakers were left unconnected.

Any rules of thumb, or specs on typical chips?
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Old 28th December 2004, 03:30 PM   #2
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Hi,

The typical amp in a headunit is class a/b and might use 50-75ma per channel with no load. Which should make it stone cold...

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Old 29th December 2004, 04:25 PM   #3
maszto is offline maszto  Poland
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The mosfets are mostly higher biased than the bipolar transistors (it could be 100 -150 mA) with no load.
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