Electronics > Repair
18V/3A HY1503 PSU - weird CC/CV behavior while charging battery cells
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xavier60:
That looks good with the 100pF. I'm curious to see it with 1K and 1nF.
iMo:
1k and 1nF..

I am going to wire up a load pulser.. I have to find here the design (the "PSU Shorter") I made years back..  ;D

PS: added with an OP37 in CV to compare..
xavier60:
Maybe C2 needs to be larger. I know from a lot of experimenting that I have never been able to get good performance from Hi-Z current sourcing LDO designs like Harrison with type 1 compensation, just the capacitor with no series resistance.
iMo:
.. and the original 100pF and 100pF in pin5 and pin 2 grounded and 100ohm to the shunt, with 741 transistorized model :)
The C11 (C4 in sim) is 10nF instead of the original 1u.
xavier60:
Does the real PSU have a problem with its CV stability?
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