Thank you for sharing. Its a very reasonably priced chip. Only ~$1.50 in "ones-n-two-zees" !
On Monday, May 5, 2014 1:18:23 AM UTC-7, Jan Rychter wrote: > > Hi, > > I finished my HV PSU design and decided to share it as open-source > hardware, for anyone to use freely: > http://jan.rychter.com/high-voltage-power-supply-for-nixie-tube-projects > > The supply generates up to 220V from a 12V input. In addition to that, it > also provides 2*Vout (so, up to 440V, for dekatrons), and two outputs for > powering digital logic: 5V and 3.3V. The primary HV boost circuit reaches > 88% efficiency when going from 12V to 185V at 55mA, with a 3% output > ripple. > > I designed it because I couldn't find anything that would make sense for > my Nixie projects. There are plenty of tiny power supply modules available > on eBay, but most of them end up being impractical: no 3.3V (for my > microcontroller) and 5V (for my 74141 nixie drivers), no mounting holes, no > >400V output for powering dekatrons. Some supplies make a token gesture > towards practicality by sticking a 7805 on the same board, but you quickly > find out that the current draw of 6x74141 is enough to require a large heat > sink on a 12V-powered 7805 (one 74141 consumes 12.5mA!). This means that > instead of a single-board power supply you end up routing your input power > all over the place, implementing your power supply in several places. > > The version I'm posting online is not perfect, but works quite well in a > number of my projects. I decided I'd rather publish it as it is now rather > than keep it locked forever. > > The design is based on the TPS40210 from Texas Instruments, as I've grown > tired of the MAX1771. I just couldn't get it to work reliably, didn't like > the pricing, didn't like the availability. > > Hope it helps someone, at least to understand boost converters better (I > certainly learned a lot while building this!). > > --J. > > -- 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/820d237b-1b69-449d-85f5-1ba4c263b4c1%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
