I'm playing with the idea to use a TPS22810 Load Switch and a non fet royer for each tube. I've ordered samples from TI. The idea to use a current regulated supply was my first try. I've build one with a LMZ22003, which is a real interesting chip, because it's output voltage can be as low as 0,8V with inrush current limiting. www.ti.com/lit/ds/symlink/lmz22003.pdf But i've dropped it, because of the biasing, gregbert mentioned, and my fear of a broken circuit, which could probably pass 12V directly to the filament. Anyway, I'm using the LMZ for driving and regulating the CCFL inverter supply, which works flawless.
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