Subject:
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Re: MOTOR DRIVERS
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Tue, 26 Oct 1999 16:22:25 GMT
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Original-From:
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Christopher Prosser <CPROSSER@ihatespamACM.ORG>
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Viewed:
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965 times
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I also remember seeing people piggybacking the L293s to double the current
capability. Thoughts?
-chris
----- Original Message -----
From: Fred G. Martin <fredm@media.mit.edu>
To: <handyboard@media.mit.edu>
Sent: Monday, October 25, 1999 2:26 PM
Subject: Re: MOTOR DRIVERS
> It won't necessarily fry the chip.
>
> L293s (and the TI equivalent) have a thermal protection mode. If the chip • gets
> too hot, it will turn itself off. Most of the time, this protects the • chip
> against over-current.
>
> However, it is still possible to fry the chip with a current spike that • will do
> it in before the overheat protection can kick in.
>
> Fred
>
>
> In lugnet.robotics.handyboard, handyboard@media.mit.edu (Larry Kruzan) • writes:
> > > Question?
> > >
> > > When using a motor which will exceed the driver chip max current, will
> > > that fry the chip or the handy board?
> > >
> > > Paul
> >
> > Hi Paul,
> >
> > I think it would take out the chip, but I am currently doing this by
> > installing a oversize heatsink & fan to the controller chip and pulsing • the
> > motor instead of constant current. Exceeding the max current capacity • but,
> > limiting duration and increasing heat dissipation works. Sometimes. :o)
> >
> > Lar
>
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Message is in Reply To:
 | | Re: MOTOR DRIVERS
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| It won't necessarily fry the chip. L293s (and the TI equivalent) have a thermal protection mode. If the chip gets too hot, it will turn itself off. Most of the time, this protects the chip against over-current. However, it is still possible to fry (...) (25 years ago, 25-Oct-99, to lugnet.robotics.handyboard)
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