________________________________
From: [email protected] [mailto:[email protected]] On Behalf Of
[email protected]
Sent: Monday, January 19, 2009 6:37 AM
To: Scott Xe
Cc: [email protected]
Subject: Re: Cigarette socket in vehicles
Hello Scott,
In the case of 12V accessories to plug in normally they have a regulator
installed to prevent the overvoltage.
Thank you.
Rob Kado
EMC Engineer - Module Laboratory Operations
Chrysler
Initial assumptions can be deceiving. I recently bought a Magellan GPS. It
operates on 5 VDC, and came equipped with an external "cigarette socket"
adapter. I assumed the cheapest, that there was a little resistor inside the
adapter, or just possibly a cheap linear regulator. On taking the adapter
apart (yes, I tend to do things like that), I was quite surprised to find a
little 2 custom IC switching converter, with input inductors, filter
capacitors and a hefty input overvoltage clamp.
The input voltage range was not specified, but it seems likely to be capable
of 24 VDC operation.
Ed Price
[email protected] <blocked::mailto:[email protected]> WB6WSN
NARTE Certified EMC Engineer
Electromagnetic Compatibility Lab
Cubic Defense Applications
San Diego, CA USA
858-505-2780
Military & Avionics EMC Is Our Specialty
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