In my opinion, 100uH is a bit low for a frequency of 40-60kHz. I would use at least 220uH. For estimating saturation current, multiply the total load current by the voltage step-up and double it (since the input current is a triangle). So if you want 15mA at 180V from a 12V supply, you can expect a peak primary current of (180/12)*0.015*2 - you should be looking for an inductor with a saturation current of at least 0.5A.
You can ease the strain on your driver transistor by using a split coil inductor - the transistor only sees half the secondary voltage. This is the generator I use on my FLW design that can drive 50mA at 180V. [image: step-up.jpg] -- 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/d524061e-8a96-4bd3-b61d-8a7a1b50dbd2%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
