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Old 6th November 2007, 08:35 AM   #1
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Default Simple convertor ?

Hi to All!

Ok, I thinking to make convertor ,convert 14v car supply to 12v/500mA; -12v/500ma; 5v/1000mA.

Regards zeoN_Rider
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Old 6th November 2007, 10:45 PM   #2
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Resistors.
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Old 7th November 2007, 06:10 AM   #3
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Resistor, to manage -12v how?

Regards zeoN_Rider
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Old 7th November 2007, 03:11 PM   #4
gootee is offline gootee  United States
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Default Re: Simple convertor ?

Quote:
Originally posted by zeonrider
Hi to All!

Ok, I thinking to make convertor ,convert 14v car supply to 12v/500mA; -12v/500ma; 5v/1000mA.

Regards zeoN_Rider
Try this automatic power supply designer, to get you started:

http://www.national.com/appinfo/power/webench.html

You could use, for example, an LM2611 circuit, to get the -12V. It can be automatically designed by the app at the link above, for most devices (although, for the LM2611, you only get a "reference design", which you'd have to modify "manually", but could then simulate at the same website).

The positive voltages are probably easier, conceptually. You could use buck (or flyback) converters, or, linear regulators. The National app at the link above will provide lots of possible devices, and usually will automatically design the final circuits for you.

Alternatively, http://www.linear.com also has automatic SMPS design software. It used to be included in their wonderful free LT-Spice circuit-simulation software (also know as SwitcherCAD). But I don't know if that's still the case, or if it's now a separate download.

If you use an SMPS (switch-mode power supply), and need less switching noise at the output, you can use an LC lowpass filter on the output of the SMPS, and get excellent results. If you need still less noise, you can design the SMPS with a higher output voltage and follow it with an LC lowpass filter and then a linear regulator. That should be able to get the theoretical noise down to well-below 100 uV p-p.

Of course, there are at least several other ways to do it.

- Tom Gootee

http://www.fullnet.com/~tomg/index.html
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Old 7th November 2007, 10:52 PM   #5
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Default Re!

Ill see when i have time btw. thanks.

Regards zeoN_Rider
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