[sdiy] Linear PSU Power Sequencing Issue

Tom Wiltshire tom at electricdruid.net
Thu Oct 31 13:22:53 CET 2019



> On 31 Oct 2019, at 10:50, Florian Anwander <fanwander at mnet-online.de> wrote:
> 
> Hi Jason
> 
> Am 31.10.2019 um 06:17 schrieb ackolonges fds:
>> and +5V (derived from the +12V line)
> Even without load at the +5V rail the +12V regulator has to provide current for loading the capacitors of the +5V-supply. This effect may become even worse, if some modules have +5V regulators on board, which use the 12V for supply.
> 
> So, my first try would be: remove the +5V supply from the +12V rail.
> 

+1 agree with Florian. It sounds like the extra capacitance on the +12V is causing a in-rush that shuts the regulator down. This won’t happen when the caps are part-charged, so it works fine once you’ve got it started.

Tom



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