Power supply for BBB

GoogleGroups
1

Hey

I would like to design the power supply for my BBB. The primary power source is a battery and therefore not constant - depending on load/remaining charge/hooked up to power supply etc…

The task is to measure the primary voltage and to supply the board from it. The support will be achieved by a constant output 5V piece.

The Voltage supervision must only work between 8-15V - therefore I introduce a voltage splitter to bring it down to 1.8 V (or let’s say 1.5 to be on the safe side). Since there can voltage ripple up to 20 V I want to protect the ADC and put a Z-Diode in scheme.

Now the questions come:

  • Would you design it accordingly or do I miss something important?
  • I couldn’t find any values on the current drain of the AIN - I kind of need that value to scale the resistors.
  • Is the Z-Diode fast enough or do I need to introduce some “inertia” by butting a coil in front of AIN?

Thank you already in advance for some inside

yours
magu_

2

i was play with that and found this solution.
http://dx.com/p/diy-dc-dc-power-module-blue-151326

if you use a single voltage regulator you should use a resistor before the voltage regulator.

3

Hi marcus silva

Thank you for your answer. The question is more on the planning side as on the actual peace which is needed. Maybe I should have picked a better title for the topic…

My questions are:

  • Would you design it accordingly or do I miss something important?
  • I couldn’t find any values on the current drain of the AIN - I kind of need that value to scale the resistors.
  • Is the Z-Diode fast enough or do I need to introduce some “inertia” by butting a coil in front of AIN?

yours
magu_