On Sun, May 5, 2024 at 11:10 AM, Rogerio O wrote:
Thank you for your reply Ozan,
But I still don't understand why there is a minimum load requirement for the +130 rail, as suggested by Morris.
According to your explanation, if it measures ok, I think I should leave it unconnected.
Thanks,
Roger
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Hi Roger,
What I meant is if the +130V measures within target,
while loaded in the mainframe, then no need to touch it.
First PSU needs a minimum total load so that switcher section works in its intended operating frequency range. Then if +130V is not loaded switcher will be able to build 130V without much work and other windings that are loaded will be at lower voltage. If it is too easy to build 130V, PSU may again fall out of its intended operating point. When +130V is loaded similar to other windings once +130V is correct other voltages (prior to LV regulators) will be closer to their target value.?
Ozan
