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Yes, when I say overcurrent I mean that the OC has been triggered.
I did put a 1nF filter capacitor on the OC pin like you said and don't have any difference.
well, the bad/good cards they both starting with the same condition (after a long break).
like I said before, 95% of the cards works...
treez, Thank you very much for your reply, I don't think that phasing is the problem because the circuit works fine at 95% of the cards, and each card is the same circuit with the same load.
Moreover when I changed the limit of 15A to 25A at the Overcurrent its work fine even at bad cards (the...
95% of the time when the converter works without the problem, the output voltage build ok, and without falling at the steady-state.
in the other 5% of the time output voltage not build at all. because of the OC protection that triggered for some reason (the problem).
thanks,
there is a soft-start capacitor of 330nF that give 85ms, is not enough? could you write how to calculate the appropriate soft-start time according to the capacitive loading?
in addtion, could you tell me if my Assumption about IC works at beginning is correct?
First thank you very much for your help.
from some reason my reply dont upload so i reply again.
the circuit is a flyback converter with 12 secondary (3.3V,5V,-5V,10V).
please tell me if i understand how the IC works at the beginning:
the IC create sequences every time (according to soft start...
Hi, I understand how the ic works according to the datasheet but it describes how it works when its close-loop, not at the beginning transient ( and its process in the beginning and how the ic know how much pulse to give to ramp voltage)
the diode/cap in the right way on the sec side. -most of the time converter works fine ( doesn't work about one in ten cases).
I try 100-ohm gate resistor, which decreases the current peak and the signal looks better (fewer noises), but the MOSFET gets very heat (about 100 degrees). can anyone...
thank you for the reply,
yes I know that soft start slowly increases the output voltage, but it makes that at large time (TSS) and I ask
specifically on the small sequence(as you can see duty cycle stay the same). why is the current continues to rise in each pulse.? what causes that? how the...
Hello,
I'm working on flyback converter LTC3805 and i have situation when sometimes (one in ten cases) i get overcurrent protection triggerd and "hiccup" mode statring. there is no short-circuit, when i replace controller the circuit works fine.
When i look on the primary current at the...
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