/Gives away closely guarded trade secrets ;-)
What is it doing?. It's a smps chip, I'll guess, giving a guessable
voltage, or not giving it as the case may be.
You can spot the input, the output, the feedback (voltage divider). With
a seven pin there may be some supervisory intelligence (watchdog, soft
reset, power down) = legs to the cpu or some driver chip.
That will narrow you down to half a dozen chips. Now examine the
application circuits in the datasheet. There's a 90% chance one of these
is copied straight in - values and all, with perhaps a very small tweak
here or there.
That is your chip. You only find them when you are hungry like me :-)
On Fri, Dec 12, 2003 at 03:04:19PM -0800, REDE enlightened us thusly
> athough not many TO220 7 leg ICs, there are a lot of differences in
> ICs of the same category. Can't take a chance there... Btw, Infeneon
> is the component production section of Siemens for two or three years
> now.
>
>
> >On Thu, Dec 11, 2003 at 02:19:19PM -0800, REDE enlightened us thusly
> >
> >
> >>Hi everybody,
> >>
> >>I have an 30 009 IC from SIEMENS that was made for Bosch. It is used
> >>in a motronic vehicle ECU. The casing is a bent, staggered 7-Lead
> >>TO-220 (T). Other data written on it : 020N S11 BE017 449
> >>probably production numbers...
> >
> >It's somebody else's chip with a batch number. Often this is done
> >when they are tested. This is sometimes done to tighten up on a spec,
> >eg 2% regulation instead of 5% on a psu chip.
> >There are not that many 7 legged TO220 chips. I'm presuming it is a
> >switched mode power supply or motor driver of some sort. Trace the
> >pins to have an idea what it does, and give up after a few hours
> >before you waste your life on it.
> >A search for "to220-7" throws up the first three results from
> >Infineon. I wonder if they are anything to do with Siemens? :-))
--
With best Regards,
Declan Moriarty.
--
Author: Declan Moriarty
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