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CD Rom PSU output in Car
CD Rom PSU output in Car
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Old 3rd September 2004, 04:29 PM   #11
dmfraser is offline dmfraser  United States
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Join Date: Dec 2003
Location: Orange County, CA
Default Regulator Drop Out

Getting regulated 12V in a car is a problem as the linear regulators generally need 3V drop across them to work. If your regulator is not rated as a "Low Dropout" type, the voltage output will not be regulated and about 2-3V below the battery voltage. Regardless, you may get erratic voltage.

For the 5V supply, you may want to consider one of the "Simple Switcher" series from National, like the LM2596. They work very well and will dissipate almost no heat.
Dan Fraser
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Old 4th September 2004, 02:01 AM   #12
cwteoh is offline cwteoh  Malaysia
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Join Date: Sep 2003
Location: Penang, Malaysia
that's is a good point... but do yo have any idea or different component to replace my current 7812? This is the problem I was think of yesterday.
C.W. Teoh
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Old 4th September 2004, 03:02 AM   #13
li_gangyi is offline li_gangyi  Singapore
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Join Date: Jun 2003
Location: Woodlands Circle
drop the regulator...and use a simple CLC filter instead...since u already have 12V from the car...otherwise a good solution will be to use LDO regulators ( which may not work when u're starting the car) or a small SMPSU from National's line up of simple switchers...
Kids in the back seat cause accidents...Accidents in the back seat cause kids...
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