With mine, I found that I got better performance with lower frequencies. For the small transformer, it could only properly regulate at a lower output voltage than the bigger transformer. Essentially, if the output voltage on your converter drops when you load it, just try running it at that lower voltage (assuming it is still high enough) and see how much you can load it.
Another thing that got me was losses in the connections to the board. I had one lead that dropped a full 1V in the input voltage. Also, if I use my power supply on a discrete board (rather than built into a full clock PCB), I get significantly worse performance because of all the leads flying around everywhere. My logs go in to all of this. On Monday, March 19, 2018 at 6:28:22 PM UTC-4, Tomasz Kowalczyk wrote: > > Thanks for suggestions. The smaller one looks like like it should do the > job with correctly designed converter - the one I found doesn't look like > it can dissipate more than 100mW without damage. > Same story for me and CJ5143 - I've received two of those as free samples. > My converter with CJ5143 wasn't a success and I don't know why yet. PCB > came out really small (22mm x 15,5mm), the transformer is used as a coupled > inductor, the driver is MCP1632. After loading it with 2mA, the output > dropped by 10V and efficiency was under 40%. I guess I need to learn more. > Now I can only suspect that 300kHz is probably too high for a transformer > with probably significant parasitic capacitances in it. I'm stil more a > "trial and error" engineer. > > Meanwhile, I came to realisation that LLC converter would be a good choice > only if I made a custom transformer - it is much more winding ratio > dependent than regular flyback/coupled inductor converter. > > > W dniu niedziela, 18 marca 2018 09:36:37 UTC+1 użytkownik Paul Andrews > napisał: >> >> Hi Tomasz, >> >> I used this transformer from Wurth in one version of my power supply: >> http://katalog.we-online.com/pbs/datasheet/74488540250.pdf. It is 4mm >> high. That version of the power supply will easily drive two tubes from a >> LiPo battery. It will manage up to four IN-12. >> >> The whole project is documented here: >> https://hackaday.io/project/27899-nixie-tube-power-supply >> >> The transformer I have settled on for my own purposes is this one: >> http://katalog.we-online.com/pbs/datasheet/749196141.pdf because it has >> more headroom than the other one. Of course, it is also physically bigger. >> >> -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/21a691e4-06b6-433e-9de8-502d6ab2f247%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
