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Bob,
I am quite familiar with that particular chip. All I can tell you is that you should get the design and try it and then decide. Linear Tech is a good company, I have a long history and an excellent relationship with them. I almost exclusively use their DC-DC converter chips. Al that said, LTC, like all other companies in the industry plays games with specmanship to highlight their product and stand out from the crowd. You can achieve their stated results under a very specific set of conditions, which I guarantee you will not exist in your real life implementation. A lot of the power loss equations have square terms in them. Therefore, as you increase the output power, the power loss increases disproportionately. As I said in my last post, I do not want to deliver a lecture on power supply design; most people are not interested and I am too busy designing one to have time for it.
The 0.1lbs weight is for the 5A reference design, with no enclosure and no heat sink.
Bottom line: Get the parts you think will give you this performance. Acquire the equipment to actually be able to test it. Then test it in real life and report back what you find.
Regards,
Hamid
bob mackey wrote:
Several asked for specs, so here they are...
As some surmised, this is lighter weight than
a second battery -- 0.1 lbs plus wiring.
It uses an Linear LTC3780.
http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1003,C1042,C1116,P10090
The spec sheet for the 12V supply is attached.
-bob mackey
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