>>>>> "Adam" == Adam Wang <[email protected]> writes:
Adam> Hi, The static current is too high (I first very carefully limited
Adam> the power source to be only 0.1A, then step by step set to 0.5A)
Adam> when I plugeg +5V in, but it still turns into CC mode on my power
Adam> supply. It's not normal.
MilkymistOne_draft1.pdf shows a switching regulator PTH0400WAH
for the 2.5 Voolt supply. Switching regulators don't like current limited
supplies, at least on startup. I suggest:
Check that all supplies don't have a sortcut,. e.g. by measuring with an
ohmmeter in diode test in the right polarity at the relevant supply
decoupling capacitors. If you see a real short, you need to rework. If all
is fine, switch on the supply with a much higher current limit, like 2
Ampere or even higher. You could also remove L7 -9 and L 11 temporary on the
first board to check the supplies first with no risk to damage the rest of
the board if someting is wrong, the resolder them if everything is okay.
Bye
--
Uwe Bonnes [email protected]
Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt
--------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------
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