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How to rate current from SMPS??
How to rate current from SMPS??
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Old 26th September 2010, 02:57 PM   #1
Zero Cool is offline Zero Cool  United States
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Default How to rate current from SMPS??

At a garage sale the other day i picked up a couple of broken soundstream car amps for a couple bucks. The smaller amp an SA-80 has a separate SMPS power supply board inside which i found very interesting as I had hoped to use just the power supply parts anyway for a LM3886 based car amp project. this board looks like it would work perfect and the voltage is about right.

it is based on a SG3524 IC with a pair of BUZ11 mosfets driving a toroid transformer, feeding to TO-220 type dual high speed diodes and 1000uf per rail. I see that the board is short stuffed and that 2 additional pairs of mosfets could be added and 4 more capacitors. a very simple design.

I am curious if i can figure how what the rated current is for this power supply? is there a method to tell? or should i just load it down and see if/where it breaks or otherwise sags past some point? I see that the SG3524 has some current limiting protection inside. maybe the supply will just shut down?? I am looking for schematics now.
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Old 26th September 2010, 03:56 PM   #2
luka is offline luka  Slovenia
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How to rate current from SMPS??
first of all this is unregulated supply, so output voltage depends a lot on input voltage.
one way is to find how strong was the original amp, my guess is that one or two LM3886 won't draw anywhere too much current, I wouldn't even try to see what the max is.

it could have overcurrent protection.
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