Interesting point Paul regarding turns ratio. The PA0367 is 1:12, and even though ringing on primary and secondary were small, it was causing havoc with devices methods for measuring primary voltage and secondary current.
On Wednesday, May 8, 2019 at 7:45:04 AM UTC-4, Paul Andrews wrote: > > I could've sworn I replied to this. Anyway, my design uses an LM3478 and > an AO4294 - a combination I have used on many boards with different > transformers - and fits on a 17mm diameter board. However driving an IN-18 > at 155V/6mA the transformer gets very hot! This particular board doesn't do > any snubbing on the primary side though. > > I have experimented with quite a few different transformers and the design > is really quite sensitive to the transformer being used. Interestingly, I > have found that a lower winding ratio generally works better I.e. I get > better performance with a 1:5 transformer than I do with a 1:10 or a 1:20. > I suspect, but can't prove, that this has a lot to do with ringing on the > primary, which is worse with the higher ratio transformers. > > I also tried one of the LT isolated switches and got nowhere fast with it. > One interesting thing about these is that they require a minimum output > current draw, something I don't like for a Nixie tube application where you > might want to turn the tubes off, and I include dimming in this, where you > are turning the tubes off and on very rapidly. > > -- 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/4eecadad-e6d3-42da-af04-5e06f82a9ce4%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
