inverting switcher

So get one that's sync rect with a force-CCM option.

Tim

-- Seven Transistor Labs, LLC Electrical Engineering Consultation and Design Website:

On a sunny day (Mon, 25 Nov 2019 16:40:55 -0800) it happened John Larkin wrote in :

If it is a wallwart just reverse the + and - coming from it and use a normal circuit? :=)

Sounds like low current

Why not a switched capacitor solution?

I'd need maybe five wall warts. That might work.

Actually, there are very few negative-to-negative switching regulators around.

I need voltage conversion and fairly high currents, which charge pumps aren't very good for. And they tend to be spikey noisy.

Or use an AC wall wart.

Cheers

On a sunny day (Tue, 26 Nov 2019 07:09:43 -0800) it happened snipped-for-privacy@highlandsniptechnology.com wrote in :

No, I should have put it better, something like this:

Yes for more than one voltage not so easy.

On a sunny day (Tue, 26 Nov 2019 15:49:03 GMT) it happened Jan Panteltje wrote in :

oops zener in wrong legg

:-)

I have one board that has 16 different supply rails.

This little one I'm considering would have +12, +5, +4, -1.2, and -5. And one variable from 2.5 to 6 or so. From a 12 volt wart, probably. Both neg supplies would be 100 mA or so. Fast parts are power hogs.

In a box this size:

I'm thinking I have to put the power supplies on the bottom of the board. I can move the board up a bit and have a 0.2" gap below. Manufacturing doesn't mind parts on both sides.

Universal-input warts are nice, with an international plug adapter set. And AC would still be a problem, getting multiple voltages of both polarities.

OK, I want a potted brick with one DC input, 12 or 24 volts, and 5 or so DC outputs. Each output should be programmable for voltage and polarity, either resistors or an SPI interface with nonvolatile memory. 5 or maybe 10 watts.

Why do you not want it? I am asking because I just discovered its existence through your post and now I wonder what catch may be there to prevent me from trying it out (not that I really need it, ltspice is just OK for me, too).

Dimiter

====================================================== Dimiter Popoff, TGI

LT3999, LT3439 or IR21531. All depends on your output power requirements, noise figure and budget.

Best regards, Piotr

How much current? For ~$5(?10?) you can get three pin switchers that can go negative ~100mA.

George H.