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Generate 22-30 volts from 12 Answered

I need to generate a voltage between 22 and 30 (for vfd tubes) from 12 volts (DC). It also has to have a minimum current output of 60mA (really 54, but I like to have some leeway). I really want to use something without an inductor (charge pump?) because I'm also driving nixies in the same area and I already have a lot going on. I would love to have something similar to the ICL7662 (essentially a voltage doubler, only uses a chip, 2 caps, and 2 diodes), but as far as I can tell it can't deliver enough power. I can't find any chip that's what I want... Help?

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guyfrom7up

9 years ago

well, after a day of searching I think I'll just byte it and use an inductor with a max1771. I'm really mad because I already have a max1771 in the circuit and it seems over complicated to just double the voltage...

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11010010110

9 years ago

555 + voltage multiplier ? i think it can give enough current if you use capacitors of appropriate size and power transistor output depends on the frequency of the 555 as well

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Goodhart11010010110

Reply 9 years ago

The frequency is determined by the resistor / capacitor combination.