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Old Jun 05, 2012, 08:42 PM
Registered User
Joined May 2012
3 Posts
Help!
Diy bec

I'd like to know how to make my own bec, but i have a problem it have to be 48v to 5v with like 100A.
Thats something difficult to find.
Can somebidy give me some material so that i can learn more abou high current BEC's
ty
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Old Jun 05, 2012, 11:40 PM
"Simplify, then add lightness"
Raleigh,NC
Joined Nov 2000
2,701 Posts
Again, you are asking beginner questions about building things that are definately not beginner projects. If you would describe what you are doing and why you need to build it yourself you might get more help.

BEC is a term used mostly in RC modeling. It is really just a step down DC to DC converter. To handle converting from 48v to 5v/100A you need a switch mode DC to DC buck converter. At 5 volts and 100 amps, you are talking about a 500 watt converter. That is somewhat more power than the typical power supply in a personal computer, so if you have ever seen a PC power supply that is the size and complexity you are talking about.

http://www.ti.com/lit/an/slua143/slua143.pdf
This app note describes some TI chips for switching power supplies and the last schematic is exactly what you say you want, a 48v to 5v/100A converter. You can see how complex it is, and the odds of a beginner building something like that and getting it working are very slim.
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Old Jun 06, 2012, 03:22 AM
We want... Information!
Bruce Abbott's Avatar
Hastings, New Zealand
Joined Jan 2001
5,179 Posts
Do you really want 100A at 5V, or 100A at 48V with a 5V control port (eg. Kelly KEB48220 100A 48V)?

What do you need it for?
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