Subject:
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Re: Replacing Motor Driver 754410's
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Fri, 13 Dec 1996 13:45:37 GMT
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Original-From:
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Tom G. Brusehaver/Consultant Euler Solutions <TGB@BNU003.CNCC.BNRnospam.COM>
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Reply-To:
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tgb@bnr.&AvoidSpam&com
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Viewed:
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1593 times
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> The 18200's are a pretty staight forward upgrade. I'm currently
> using two of them to run a couple power widow motors from a 12V gel cell.
> They work great. They get hot pretty quick, so a heat sink is a definite
> must.
I concur here, I have a 6inch X 6inch piece of aluminium for 2 of
them, and this seems to dissapate all the heat I am generating. I
could see longer runs or steeper grades would require a larger
heatsink.
> Scan through the list archive, there's some past stuff about using
> the 18200's. You can use a ribbon cable dip header to replace the
> 754410's. Very easy. The current sense feature is pretty cool too. One
> resistor and one analog port on the HB, and you can get a current reading
> from the motor.
I was the one who originally posted the 18200 to HB connection, and
it was wrong. I had a couple pins switched. I have the correct
version attatched. This doesn't have the current sense or anything (I
havn't got to that yet :-).
One thing I forgot to do early in the assembly was to connect the
18200 to the signal ground on the HB. Boy did they act funny then.
> I've got a circuit board pattern for two 18200's and associated
> stuff that has screw terminals for the high current end, and a 10 pin IDC
> header for the control signals. It's not a straight connection to the HB
> but it makes things neat. If you want the pattern I can send a PS version
> of it.
> Check out National's web site. You can get the tech docs on the
> 18200 and order some _FREE_ samples. No loss in giving them a try. :)
That is how I got mine.
> I have had no trouble with them
Me either.
> CORRECT
> >
> > ------
> > /| |-----
> > / | |---------- Motor
> > / | LM |-----
> > / |182 |-----
> > / | 00 |--------GND (motor and signal)
> > | * | |--------motor power (12-55V)
> > \ | |--------hb pin 1
> > \ | |----- gnd (brake)
> > \ | |--------hb pin 2
> > \ | |---------- Motor
> > \|pin1|-----
> > ------
> The PWM inputs for each L293 are pins 1 & 9, right? And the direction
> inputs are 2, 7, 10, & 15? With each pair of direction inputs using an
> inverter.
>
> The data sheet from National gives pin 3 as direction and pin 5 as PWM.
> Did you connect it like in the picture or is the picture wrong.
>
> I thought I would ask before a I etch my board for the 18200's.
Glad someone checked it, yup, the drawing is wrong.
pin 3 on the LMD18200 goes to pin 2 on the handyboard, and pin 5 on
the LMD18200 goes to pin 1 on the handy board.
--
tgb@bnr.com
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Message is in Reply To:
 | | Re: Replacing Motor Driver 754410's
|
| (...) Scott The 18200's are a pretty staight forward upgrade. I'm currently using two of them to run a couple power widow motors from a 12V gel cell. They work great. They get hot pretty quick, so a heat sink is a definite must. Scan through the (...) (28 years ago, 13-Dec-96, to lugnet.robotics.handyboard)
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