Subject:
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Re: voltage regulator current rating
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Thu, 16 May 1996 18:11:28 GMT
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Original-From:
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MAR ERICSON <MAR@COOPER.spamlessEDU>
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Viewed:
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1409 times
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>
> > Does anyone know the current rating on the 5V voltage regulator located next
> > to the power switch? I am using a bunch of IR sensors, and am supplying
> > power to them via the +5 V bus, but my VR seems to be getting quite hot.
> > The sensors draw around 500mA, which might cause a 500mA VR to get quite
> > hot. Any input would be greatly appreciated. Thanks... -Zak
>
>
> The rated total is 1 amp. The HB itself draws 100 to 200 mA? I'm not
> sure, I haven't measured it exactly.
>
> Since the HB's battery is 9.6v, and the output voltage of the
> regulator is 5v, the thing drops 4.6v, and at 600 to 700 mA of current
> that would be 3 to 4 watts of power dissipation (e.g., heat). This is
> a lot for the thing to handle without an additional heat sink.
>
> It will probably live, but I would attach a heat sink.
>
> -Fred
Is there any current going directly into GND from the LM2931Z-5.0? If so, would this cause any "extra" heat other than from the current the HB draws?
-Eric
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Message is in Reply To:
 | | Re: voltage regulator current rating
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| (...) The rated total is 1 amp. The HB itself draws 100 to 200 mA? I'm not sure, I haven't measured it exactly. Since the HB's battery is 9.6v, and the output voltage of the regulator is 5v, the thing drops 4.6v, and at 600 to 700 mA of current that (...) (29 years ago, 6-May-96, to lugnet.robotics.handyboard)
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