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'anybody know of a 2003 equivalent with built in sh'
2000\05\20@003352 by vrf.craig

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I am using some Darlington transistor arrays that are ULN2003A or TD62003AP parts.  If there is a short circuit, the chip will fry.  I think there are more expensive parts that I can use, in place of the 2003 series, that will not allow themselves to fry.

Can anybody point me in the right direction, or make a suggestion?

Or, better yet, know of an IC part and where the data sheet is?

Thanks all!

C.
 {Original Message removed}

2000\05\21@174111 by Peter L. Peres

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Hi,

I don't know about any cheap replacement for ULN2003 but a small resistor
placed between the GND pin of the ULN and GND has saved many chips on the
workbench. This is a hack, but it works for testing & prototyping. I used
R = 10 ohms, 1 W for this. The scheme could be elaborated by using a
polyfuse in parallel with the R = 20 - 47 ohms. When the circuit is ok the
polyfuse conducts. If something goes wrong, it opens, and R together with
the drive of the ULN form a current generator. By choosing R right it is
possible to keep the heat on the ULN low enough so it should never be
destroyed. If the load is reactive this may oscillate as far as I know. I
had bulbs for loads when I used this. Use at your own risk.

hope this helps,

       Peter

2000\05\21@184641 by vrf.craig

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Thanks Peter... I will look into this.  But, if the short stays, something is gonna blow, and I am sure there was a darlington transistor array chip with built in short circuit protection.  Damn if I can remember where I found it!

Anybody else got $0.02 to throw in by way of leads or ideas?

How can I keep a darlington transistor IC from frying if an output shorts?

Craig


 {Original Message removed}

2000\05\22@011941 by Vasile Surducan

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On Sat, 20 May 2000, vrf.craig wrote:

> I am using some Darlington transistor arrays that are ULN2003A or TD62003AP parts.  If there is a short circuit, the chip will fry.  I think there are more expensive parts that I can use, in place of the 2003 series, that will not allow themselves to fry.
>
> Can anybody point me in the right direction, or make a suggestion?
>
> Or, better yet, know of an IC part and where the data sheet is?
>
 ULN 2003...2803 family is the cheapest and best solution if you not
exceed absolute maximum ratings value ( in special the current )
For other IC try http://www.questlink.com is pretty good
Vasile

2000\05\22@012406 by vrf.craig

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Thanks for the tip!  But, I am trying to avoid a failure of a part that produces a short circuit.  So current WILL fry the 2003, as well I think the 2803.  I am looking for a 2003 style chip with built in short protection... I know they are there, but I don't know which to get!

Keep the ideas comin, maybe we'll get a winner soon!

 {Original Message removed}

2000\05\23@050632 by mike

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Texas Instruments have such beasties for use in automotive control
apps. TPIC2404 is one that comes to mind, never used one though.

perhaps this should be OT or perhaps EE

Mike W

On 23 May 00, at 0:01, Automatic digest processor wrote:

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