On 17/01/2013 7:41 PM, RussellMc wrote:
> Joe said
>
>>> http://www.intusoft.com/onsemipdfs/an920-d.pdf
> Very droll.
>
> Fig 22 does what you want.
> Use PNP of choice.
> If saturation voltage too high (which it ought not be) use MOSFET
>


Figure 22 in that PDF ????

Figure 18 (page 17) seems to be what Joe was talking about, but surely=20
scaling that up to 3 Amps (or more) output is not trivial for someone=20
who doesn't design power supplies every day.  I can imagine the diodes=20
and inductor get fairly large.
David...

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