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 [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/ca10672d-b8ca-43f6-a0ee-4f639cb356e9%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
