On 2/28/12 4:48 PM, Deviantgeek wrote:
I was looking at the Supertex drivers, mainly the HV5522. Its 220v vs
300v, would that still work? I am driving 6 IN-18 tubes. I was also
looking at the SN75468, and a few 50v drivers(TPIC6A596)which I think
is too low... I will be building several clocks, and I want good,
reliable, cheap drivers.
(this is just for the cathodes)
The voltage required depends on what sort of control you plan to use,
and how many volts you apply to the anodes. The important thing to
remember is that if one cathode is lit, then the other cathodes don't
need more than 50V to turn them off. That's why the 74141 works with its
55V Zener diode clamps on its outputs.
If you want to display one or two cathodes in every tube at all times
(no blanking, but possibly fading between numbers), then a 50V driver is
barely sufficient. Or you can use an anode driver to blank the tube. I
use the TD62083 in my Nixie watch, and it works fine.
If you want to blank the digit with the cathode, then a 100V driver
would be necessary and you'd need to use a power supply below 200V.
If you want to blank the tube and use a >200V supply, then you need a
higher voltage cathode driver or an anode blanking circuit.
I think most of the Supertex parts want 12V on their signal lines, so
they are not very easy to use since normal logic uses 5V levels.
--
David Forbes, Tucson AZ
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