In article , Joerg wrote: [...]
There's a job for JT. Do a micro-controller in Supertex's high voltage CMOS process. Just think a PIC that does 60V swings!
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kensmith@rahul.net forging knowledge
Bipolar transistors for SMPS?
Jan 20, 2005
23 Replies
In article , John Larkin wrote: [...]
+----------+-------+ ! ! ! / ! ! \ ! ! / ! ! \ ! ! ! !/e ! +--------! PNP ! !/ !\ !/ ----! NPN +-----! NPN !\e ! !\e ! \ ! ! / ! ! \ ! ! / ! +----------+-------+This avoids having to deal with a 1.4V e-b drop of a darlington.
If you really want low drop, use a germanium transistor.
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kensmith@rahul.net forging knowledge
In article , Jim Thompson wrote: [... me ...]
I assume volts per foot remains constant in all directions unless you raise the resistivity of the silicon too, but why grumble. A micro that would (at least) run on a 9V battery would be a nifty thing to have. I'd bet if someone brought one out they'd make litterally dozens of dollars on it.
The poor fellow has a switcher based on some micro (PIC like I think) that is now running on 3V instead of 5V. He needs to redesign the output section to run with a 3V input.
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kensmith@rahul.net forging knowledge
Hi Ken,
It doesn't have to be big. Once we designed a chip that was running low voltage for RF amps, muxes and so on but it had a high voltage extension. Actually the process claimed 60V just as you had mentioned but in the end we had to keep things below 50V. It was about 2mm by
10mm, not bad considering that it could handle 64 input and 16 output channels. Electro-migration is another issue but this was for a disposable product.More likely it would be an MSP430, a family that migrates from 5V to
3.6V and less. But the same is true for a lot of logic. Also, there is a desire to run equipment with the least number of cells, typically two.Regards, Joerg
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