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Registered Member #2614
Joined: Sat Jan 09 2010, 08:57AM
Location: Bucharest, Romania
Posts: 26
Indeed. If you're talking 500 watts instead, then yeah. But for 5W, don't bother. Especially since you will have it running off AC line. Just use a linear regulator.
Registered Member #1617
Joined: Fri Aug 01 2008, 07:31AM
Location: Adelaide, South Australia
Posts: 139
Unless you've got loads of time spare and really want to learn about this stuff, (or are getting paid well to design it!) then it is simpler to just pick a ready made product. You can always crack it open out of curiosity if you can't help but gain the knowledge of how it works. It's much easier to start with something that works, than spend weeks pondering over a new design that doesn't!
Its actually to power a little controller for keeping a friends home brew at the right temperature, I have a small NPN transistor as the temperature sensor and there are some variable temperature thresholds etc, then it drives a relay to switch a heater on or off. Initially I bought a 12v plug pack and broke it open to use the guts of that, but that blew up (poor quility product, not over stressed!), so I thought I'd build something my self. Im fine with SM supplies, its just how they hell they mamaged to power the little IC and start it that puzzled me! Plus I have a number of future projects that require electricity to work, so I could upscale any design I come up with now for future use, so that is the main reason to bother. Plus I do like to know how stuff works.....plus Im trying to teach my friend about this sort of stuff....so it all has a purpose really.
a lot of your time going round and round the iterative design process in an attempt to arrive at a design that is stable for all imaginable line-voltage variations and load variations, open-circuit protected, short circuit protected, minimal ripple, low EMI etc.
Easy, it will have a fuse. If the fuse blows, then it was overloaded or over volted. If its under volted the switching transistor will blow (I guess) thats how you tell
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Any ideas for this power supply?
