Moin,
On Sun, 26 Feb 2012 09:20:22 -0800
Soren Kristensen <[email protected]> wrote:
> The net5501 power input is decoupled with a low esr 330uF electrolytic
> capacitor and two 2.2uF ceramic capacitors.
>
> The 5V, 3.3V and CPU core regulators each have 1000 uF low esr
> electrolytic capacitors and plenty of large ceramic capacitors.
>
> So pulses like that are simply not possible, you might want to ensure
> you measure correctly, you can easily pick up noise from the inductors
> or other sources. Maybe with a 50 ohm probe directly over a capacitor.
I wouldn't say impossible. But yes, you are right, it's most likely
noise that i picked up (as i said, it's not HF equiment that i used).
But then i wonder what's going on.
> > The inductors look like they can take 1-2A each..
>
> The inductors are of course dimensioned to the need of the system, the
> 5V rail and 3.3V rail are both designed for 3.5A each, there should be
> at least 12W combined left for expansion....
Hmm.. how is that 12W split? I doubt it's 6W on the 5V and 6W on the 3.3V?
Is there a current sense resistor somewhere i could measure?
I'm currently leaning towards that i pull too much power from one of
the rails.
Thanks for the various info!
Attila Kinali
--
Why does it take years to find the answers to
the questions one should have asked long ago?
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