[Lab] AC adapter question
mike.ayukawa at gmail.com
Thu Jul 11 19:08:25 EDT 2013
The spec sheet says 83% efficient. It is a 25W supply so at most you will be dumping 5W.
The beauty of a switching supply is that you don't just dump the excess power like a linear supply.
But the quiescent losses will be there.
Regardless your challenge is to get rid of this heat. Even at a few watts.
A fan is a pretty good idea and 5V fans are plentiful.
The supply does not suited to mount a passive heat sink.
It is a nice looking supply. It would be shame to have it melt down. Or catch fire.
70C will feel very hot to touch (max rating).
On 2013-07-11, at 6:49 PM, Britta Evans-Fenton <technical at artengine.ca> wrote:
> A little question about AC adapters.
> I have an artwork that I did that I used an AC adapter to get power. It was on for 4 days during a show, and I was surprised on how hot it got. (I almost burned myself). I did have duct tape on it holding it to the back of a wall, so that may have been half the problem.
> I'm showing the work again, but I'm wanting to make sure everything is safe. I need to hide the adapter due to aesthetic reasons, so I wanted to create a little white box around it with air holes, and I was suggested a fan, although it if it getting hot due to over working, adding another fan might not be a good idea.
> It is only a bunch of IR leds that it is powering, so I'm surprised at the power I am needing.
> any help would be very well appreciated.
>>> Here is the Adapter I used :
>>> Here are the IR LEDS:
>>> And the Resistors I have on them were 91 OHM 1/4W 5% CARBON FILM.
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