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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/5abe0c61-3c71-43e7-8196-41a1a0e5eee9%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
