Subject:
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Re: Burning hot motor driver chips.
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Sun, 9 Nov 1997 16:33:55 GMT
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Original-From:
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David Kott <dakott@(avoidspam)kott.my.domain>
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Viewed:
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1518 times
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> was a faulty assumption). So I connect the steering motor to motor1 and
sounds reasonable.. which "car" BTW? Some may be using that very same
platform and may have some timely advice for you.
> the drive motor in motor3, so each motor has it's own driver chip. Well
> after a few cycles of the below code, the drive motor ceases to get enough
> power to move the car (the motor begins to spin if I pick the car up).
sounds like overload/overheating cutoff to me.
> Upon burning my finger, I discovered that the chip running the was
> extremely hot. So my question is: Is this motor simply drawing too much
> current? I thought the L293D (which is what I am using) had some sort of
> built it cut off if things got intolorable for it. I also understand that
> the L293D can be piggy backed, but will that give me enough amperage to run
> a typical RC car motor? Am I going to have to use an alternate driver?
This is from the Handy Board FAQ :
<---snip--->
It is possible to wire two of these chips in parallel (e.g., two
L293D's or one L293D and one L293B) to gain increased current-carrying
capability. This readily done by plopping one IC on top of the other
and individually soldering each matching pin together.
Another way to achieve greater power-handling capability on the Handy
Board is to use the Texas Instruments TI SN754410 Quadruple Half H
driver, which combines the protective diodes of the L293D chip with
the greater current capacity of the L293B chip. The SN754410 is a
plug-and-play replacement for the L293D.
<---snip--->
*visions of a great stack of '293Ds growing out of a HB*
So, indeed, it seems that, as you say, you *can* either parallel two (more?)
chips together OR go to an enhanced pin-for-pin replacement IC.
<two_cents>
You also might want to think about heat sinking those chips. Either a DIP
style heatsink (I *have* seen them) to affix to the back/top.. or something more
elaborate.. as I *think* the center two pins on on each side of those packages
are meant to be affixed to a heatsink/metal/large-copper-traces/whathaveyou...
but don't quote me.. I may be thinking of some other package. (Prototyping
is an adventure, no?)
</two_cents>
-d
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