Negative Voltage Offline SMPS

Dec 15, 2007 3 Replies
B

Good day everyone,



Can anyone shed some light on making a negative DC voltage mains(offline) SMPS?



I've designed quite a few offline switchers, but i've always created



+9 or +12V DC with them. Now, I have a requirement for a -48V DC Power supply that runs off of mains (65-280VAC) power. Incidently, I need it to give me about 4A (200W).

I'm familiar with offline switchers, and I know the dangers and precautions.



Any help greatly appreciated! Ben


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B

Oh, Also, Space is tight. All of the offline switchers I've made in the past have been somewhat physically large - can anyone give me some tips for lowering the size of the footprint (Especially the HEIGHT).

Thanks again! Ben

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J

Design an isolated +48 volt supply, and use the positive terminal as the common.

Regards, John Popelish
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J

Umm, reverse the outputs?

John

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