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Old 20th February 2004, 03:01 AM   #1
cm961 is offline cm961  Canada
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Default SMPS Idle Current

Hi guys,

I'm debugging this car audio amp. The idle current is about 1 amp or more. I'm not sure if ALL of this power is being dissapated in the main transformer, but it does get quite hot (not too hot to touch, but still really hot).

I thought SMPS are supposed to be very efficient. Is there something wrong with this one or is it normal? The amplifier does work but needs new input filter capacitors. However, when I connect these capacitors the amplifier becomes unstable. Without them it functions fine. I doubt it would work in a car environment though, compared to the 12V provided by my bench supply.

Any comments greatly appreciated!

Thanks,
Pete
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Old 20th February 2004, 04:52 AM   #2
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Probably hyseresis loss or something. It's a "background" condition and is about constant whatever the power level is. Considering most such car amps are over 200W output, it sounds like the PSU is running right where it should be. (Maybe... 80% efficiency?)

Tim
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Old 20th February 2004, 05:56 AM   #3
cm961 is offline cm961  Canada
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Ok thanks for the reply.

The amp seems to work fine. I was only able to test up to about a 2A current draw from my lab bench supply. When I have time I will purchase a better soldering iron that can actually make proper connections. Then I will be able to package the amp back up and test it inside the car. Right now the capacitors are connected with clip leads...

Pete
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