On Mon, Jul 4, 2016 at 9:14 PM, 'Morgaine' via BeagleBoard <[email protected]> wrote: > John Syne writes: >> >> > a power supply that is spec’d at 4A should not shutdown when it sees a >> > 4A load, but rather, it should current limit at 4A. If the power supply is >> > spec’d at 4A, then 4A should not be treated as a short circuit. > > > That's impossible. You can't recommend that fundamental electrical laws be > overridden. :P > > If a PSU current limits at 4A, it can do so only by reducing its output > voltage. This may then drop below specification for its load and this can > have very bad consequences such as non-stop rebooting. There is no way for > the voltage to be maintained above its minimum spec while still providing a > current limit.
Yes, but remember that the problem here is a startup inrush current, which would be handled properly by current limiting. After all, that's what the 2A current supply is doing: essentially, it soft-starts, providing limited current charging the input caps, while ramping up the voltage. Once the caps are charged and the supply voltage stabilizes at the nominal value, the system progresses to boot. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CAC%3D1GgE8MbV7LXVsU3SDOYyu%2Bie_8snkR4Lb0HjBb5153T1XXg%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
