I'm slowly beginning to understand more, but on reflection I am clearly not understanding something. The HV5530 specs say output voltage is 0 - 300V. What sets that voltage? That might also be the wrong question, I am in the dark about how tying these 'outputs' to the cathodes actually works.
At some point I will buy a couple of different chips to play around with, which raises a whole other set of questions about how I would breadboard something with these chips. On Tuesday, February 21, 2017 at 7:03:22 PM UTC-5, gregebert wrote: > > I took a quick look at the HV5532 datasheet, and the 15V output-low > voltage is at 100mA, which is far more current than you will need for a > nixie. The outputs will tolerate an anode supply of +220V, so that gives > plenty of margin. > > So, if you have an anode supply of +200V, you can calculate a rough value > for your anode resistor from R = (Vcc-Vnixie)/Inixie . Assuming Vcc=200, > Vnixie=145, Inixie=4ma you get about 13K for the anode resistor. These are > approximate values to get stated; you definitely need to bench-test the > design and pick the appropriate resistor to maximize tube life. Tweak the > anode resistor until you get the recommended anode current. Be sure to use > a large-enough power-rating for the resistor. In this example, the power is > 220mW so I would use a 1/2W resistor, not a 1/4W. > > Be careful driving in HV5532 from 3.3V logic levels. Per the datasheet, > Vih (min) is 0.8*Vcc, or 4.0V. Technically, a logic signal from a 3.3V > device *will not meet spec*. It might work in certain conditions, but I > question it's reliability. I personally would not implement any design that > violates spec, as it's an invitation for trouble even though it might > 'work' under certain conditions. > -- 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/d380af74-3ea4-4d33-b1ac-be4ea4ac569b%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
