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Registered Member #2703
Joined: Sun Feb 28 2010, 06:02PM
Location:
Posts: 18
i am building a 100w audio amplifier based on the tda7294 and it requires a +25 -25V power supply. i thought of using a rewound microwave transformer but it is not very efficient and gets very hot when running for hours
so i want to build a switch mode power supply based on the IR5151 driver ic. the diagram is for a flyback transformer but i will replace that with a ferrite transformer from a monitor wound for 25v
will this smps be more energy efficient than a rewound mot and will it be able to run for many hours.
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
Do not use a MOT for a audio amplifier, as you simply put it, it gets warm due to it is initially designed to only be run for a few minutes at full power.
It is a long and very theoretical way to design a SMPS, there are so many parameters to take care off when you also want to make your own transformer.
I suggest that you look up some of the examples published by the IC and core manufacturers. Google SMPS design guide or something similar.
Good luck with your SMPS project, but if you want a simpler way out, find a suitable transformer, rectify it and have some large lytics to smooth the DC.
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IR2151 SMPS
