Hi Luka Linear for sure has a more retro feel to it and will still be going in 25 years, but if you are already down the switching path then I think this one deals with the most immediate issues. It has a nice heatsinkable MOSFET in it, and the active pull down and the current sense resistors.
If I am not wrong, the original designer might be in this group, and I believe offers that design on Ebay. Not trying to hard sell you, just saying... You could save yourself an evening or two, and give him a nod of thanks as well. I'm working on a switching design based around an ATTiny at the moment, but this is just because of my perverse nature... On Wednesday, 23 September 2015 22:06:21 UTC+2, Luka C wrote: > > > <https://lh3.googleusercontent.com/-v0bjuN0XQWg/VgMGNJhH7bI/AAAAAAAAAF0/vLSC_u2tz3M/s1600/mc34063_mk15cm1.gif> > > > The picture seems to be moved, so this is the PS I'm planning to implement > into my design. Do you think this one is fine for 4x IN-14 and 4x INS-1? > Thanks. > > Dana srijeda, 23. rujna 2015. u 20:39:23 UTC+2, korisnik Luka C napisao je: >> >> >> Okay, so I read all the advices and thank you all for explaining the >> problems with this power supply. Since the board is extremely small and I >> will be installing it in a very thin housing, I don't really have much >> space to do modifications on it. So, I'll implement PS in my PCB design and >> solder its components on it. >> I'd like to know if you could check this PS and see if it should be ok >> for my clock (4x IN-14 and 4x INS-1 tubes)? >> >> Thanks a lot in advance. >> >> >> <https://lh3.googleusercontent.com/-b9BU5T8kpY4/VgLxiEHdmZI/AAAAAAAAAFk/x7hJ0aVd_dA/s1600/mc34063_mk15cm1.gif> >> >> Dana utorak, 22. rujna 2015. u 21:23:39 UTC+2, korisnik gregebert napisao >> je: >>> >>> Why not just use a totem-pole pre-driver for the MOSFET ? >>> >>> BTW, this touches on a challenge when designing HV drivers, whether they >>> are for DC-DC converters or driving cathodes. Most high-voltage NMOS >>> devices (~400V) need 5-6 volts for solid gate turn-on, yet logic-levels on >>> most micro-controllers and FPGAs are only 1.2 to 3.3volts. That leaves a >>> few options: >>> >>> 1. Use high-voltage logic, such as 4000-series CMOS, to drive HV NMOS. >>> My first nixie clock does this. >>> >>> 2. Use NPN drivers; you can easily design constant-current drivers >>> running from 3.3V. I've used surface-mount devices with 2 NPNs inside, and >>> they are rated at 250V. >>> >>> 3. Use a level-shifter between your logic and the driver. I'm doing this >>> on my current design with a HV5530. >>> >>> 4. Find a device with a low-voltage gate. Good luck on this; most >>> logic-levels NMOS devices only handle 60V or less. If you also want low Rds >>> (necessary for DC-DC converters), you have even fewer options. >>> >>> 5. Pull-up resistor. Ugghhh... It will work, but you will burn more >>> power. Could be dangerous for a DC-DC converter if the logic/software >>> turning off the gate goes haywire, which would lead to large >>> current/burnout. >>> >>> >>> I advise against relying upon the voltage-drop of the nixie tube to >>> protect the driver, though this is commonly done with designs using the >>> 74141. I always select my driver to handle the maximum-possible anode >>> supply, and add margin above that. I've never had a fried driver, ghosting, >>> etc. Parasitic capacitance and leakage can stress drivers above their >>> maximum ratings, which will lead to premature failure. >>> >> -- 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/d54b56ce-eaa5-4699-a2c1-ad4d65bea0e2%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
