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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 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 has 1 Reply:
 | | Re: MOTOR DRIVERS
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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 (...) (25 years ago, 26-Oct-99, to lugnet.robotics.handyboard)
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Message is in Reply To:
| | Re: MOTOR DRIVERS
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| (...) 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 (...) (25 years ago, 25-Oct-99, to lugnet.robotics.handyboard)
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