Hi Greg. I took a look at the transformer you are using, but I opted for this one from the same family instead: *LPR6235-253LMRB*. It is 1:10 and has a much higher Isat than the one you are using. Amazingly it fit on the same footprint and it runs at a cool 100F at room temperature. Very happy.
On Thursday, May 2, 2019 at 1:59:20 PM UTC-4, Paul Andrews wrote: > > One project I have on the back burner is a very small battery-powered > nixie display. I thought that a variation of a power supply design that I > had been using for everything else, would work fine. It turns out that the > prototype of the power supply, which I had built a few years back, only > worked because of a dry solder-joint somewhere on the mosfet (yes, I'm > serious). The version I built specifically for this project quickly had > everything overheating. When I went back and touched up the soldering on > the prototype, it showed the same behavior. The culprit, BTW is pretty much > down to the tiny 1:20 transformer. I have built variations of this design > with bigger transformers that work very well. > > There are a lot of variations of power supply design that I could mess > with - obviously I have already scoured the internet on this topic - but > that is the trouble. This project will never get finished if I have to run > through multiple prototypes trying to find one that is small enough and > that works. So I was wondering if anyone could just say 'use this design'. > > The constraints are: > > 1. It has to fit on a circular PCB the same diameter as the tube or > less (about 17mm). > 2. It has to provide around 150V-160V regulated output, or maybe just > 'limited' output. > 3. It only has to provide 1.5mA to 2mA. > 4. It has to use a LiPo as the power source, so it should work at > voltages between around 3.5V and 4.5V. > 5. It has to use parts I can get from digikey (so no sourcing > transformers from old cameras that I can't find for example). > > Surface mount components are fine... > -- 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 neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/480f2723-d181-40c3-8070-54c5628fa9f8%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
