BEC Circuit Board

slbaker's picture

Here's a schematic for a very simple 20V-to-60V DC input to 12V DC output.
All the parts are available at digikey.com and the
parts cost is less than $15 (not counting the circuit board).
I may decide to make a circuit board if I can find some spare time
This same circuit can be used to make a 5V DC output regulator by just
changing the LM2576HV-12 to an LM2576HV-5 and a 6V regulator can be made
by adding a single resistor to the regulator's feedback path of the
5V regulator circuit.

http://mysite.verizon.net/sierracircuit/Free-Stuff/DC-DC-12V/schematic.pdf

The LM2576HV-12 switching regulator is rated at 3A, but the coil that I
chose is rated at 2.5A continuous current. Even so, that's 30W.
I have not built one of these yet, so I don't know how hot
the coil or regulator would get when running continuous high current.
The LM2576HV's TO220-5 case allows for a heat sink if needed.

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