Possible DC power solution to SLR camera, no inverter, for timelapse???

Started Aug 20, 2011 | Discussions thread
spt_gb
Senior MemberPosts: 2,876
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Re: Well, you could start by looking at this
In reply to Yargo, Aug 23, 2011

Yargo wrote:

spt_gb wrote:

http://www.slscope.co.uk/electronics_projects/ptn78060w/ptn78060w.html

It's a bit of an exotic part (not something you'll find of the high street) but will manage 95% conversion efficiency and will deliver between 2.5 and 12.6V @ 3A from a source of between 7 and 36V. Don't try to skimp on the regulation capacitors (the author of the above seems to have confused minimum with recommended values) and make quite sure that there's no danger of shorting input to output.

I stayed away from switchmodes .... noise can be a pain with them !
A nice little "hybrid" regulator device though

Just noticed SherwoodPete posted a linear reg before me !

There's the problem. A linear regulator dropping 12V down to 7.4 will be throwing nearly 40% of the power away as heat. A switch mode converter loses only 5% for the same drop, but introduces high frequency noise (hence the need for smoothing caps) . Using a switch mode supply a little above your target and then a linear regulator for the final drop helps cure the noise, but will reduce efficiency (to a lesser degree than a single regulator mind you). You pay your money and you take your chance.

I am "on form" this week

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