Re: Bandgap Design


Tim Hubberstey wrote:
> John Woodgate wrote:
> > I read in sci.electronics.design that dagmargoodboat@xxxxxxxxx
wrote (in
> > <1112178592.436321.247530@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>) about
'Bandgap
> > Design', on Wed, 30 Mar 2005:
> >
> >> Could well be -- Tim didn't give any part numbers. The few blues
I
> >> scared up on Stanley's site, however, were InGaN. No d(Vf)/dT
info --
> >> I couldn't read their .PDFs.
> >
> >
> > I can, but indeed, there is no d(Vf)/dT information
> >
> >> Their site, www.stanley.co.jp, makes capital punishment obsolete.
>
> I used the US site, not the main Japanese site. I found it mildly
> annoying, but not enough so to scrounge up another site, especially
> since I'd already gone through a few other sites and found no data at
all.
>
> <http://www.stanley-components.com/en/search/search_top.cfm>
>
> I don't remember which devices I looked at, I just used the search
tool
> to pull up devices of the specified colors and chose the first clear
> package in the list. Acrobat reader 5.1 had no trouble displaying the

> sheets, except for the usual squawk about missing Asian fonts. Most
> likely, most of the data came from the *** for the 38_3X series. I
> didn't check the semiconductor type since I was only interested in
d(Vf)/dT.
>
> The d(Vf)/dT info came from the graph(s) a few pages into each data
> ***. I used the 1 mA line for all devices and calculated d(Vf)/dT
from
> 2 points, usually -40C and +60C as this was easiest.
> --
> Tim Hubberstey, P.Eng. . . . . . Hardware/Software Consulting
Engineer

Thanks. The UB5306X data*** pg. 7 reveals all: I get the same
result (~-3mV/C) over the same temperature range as you did (-40C to
+60C), but note that the slope is about -4mV/C below -5C, and about
-2mV/C from roughly +20C & higher. (This part is InGaN.)

Windows being what it is -- delicate -- I distain installing new
applications where possible. Here though, I took the opportunity to
load the latest FireFox browser and a later version of Acrobat Reader,
whereupon I was better able to load and read Stanley's documents. I do
wish, however, that webfolks as a group would ease up on the bandwidth,
and hang on to all those pretty pictures and nifty scripts. Please
webweenies, just give me the facts.

James Arthur

.