a.s.elliott(at)cox.net
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 Posted: Mon Oct 27, 2014 11:17 am Post subject: brown-out protection from automotive world |
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6 years ago I invested <$100 in a 90W 12V/5V DC-DC regulator from Carnetix normally used to power car PCs and advertised to “survive engine cranking under full load over entire temperature range”. The actual specs say it will maintain 12VDC output ±5% from 7.5-18V input from -10°C to 70°C
I use the 12V output mainly to power my MGL EFIS and the 5V output for my fuel flow sensor and for a panel USB port. Main reason was to get cleaner power, not for brownout protection, but it does both. Was unsure of its reliability, so I wired it with a bypass to the main buss, knowing I would lose the USB and fuel flow readout if I had to bypass. Comes in an aluminum case with an internal fan you can barely hear with the engine off.
So far, in 6 years of mountain operations where it gets very hot and very cold under the panel, it has never hiccoughed and has never let anything shut down, even during extended engine cranking at temps near -20°C when I nearly went through both PC-680s!
I don’t work for or have any interest in Carnetix. Checked the web site www.carnetix.com, and the same power supply, CNX-1290, is still available for <$100! They also have 140W and 185W (250W(at)24V in) versions which also offer PC-type 18-20VDC outputs if you need such.
FWIW,
Andy
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Andy Elliott, CL:480-695-9568
N601GE/Z601XLb/TD/Corvair
630 hrs since 11/08
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