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PICList Thread
'(Fwd) Re: Cheap Motor drivers [OT]'
1997\09\10@172809 by lilel

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------- Forwarded Message Follows -------
From:          "KcW" <spam_OUTkcw.kcwccTakeThisOuTspamsympatico.ca>
To:            <.....lilelKILLspamspam@spam@toastmaster.com>
Subject:       Re: Cheap Motor drivers [OT]
Date:          Wed, 10 Sep 1997 17:11:10 -0700

>I just designed a circuit for a 12V/6A trolling motor. Do you have
>TinyCAD? If not, I'll send you both TinyCAD and the schematic. I had
>a problem with blowing one leg of the H brdge until I substituted
>MOSFETS. The total price was roughly $20 - $10 of it in heatsinks
>and you can breadboard it first. It uses a 555 time to PWM a 5
>MOSFET bridge. It works fine.
>
>KcW

'S ok.  I don't need to handle near that much power.  I'm looking for
something that will run a motor that uses 200 milliamps at 24
volts.  I'm trying to avoid building a discrete H bridge cuz
SOMEBODY has done this before and put it obn a chip.

-
Best Regards,

Lawrence Lile

1997\09\10@172938 by lilel

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------- Forwarded Message Follows -------
From:          lpaynespamKILLspammedia-garden.com (Larry Payne)
To:            "'.....lilelKILLspamspam.....toastmaster.com'" <EraseMElilelspam_OUTspamTakeThisOuTtoastmaster.com>
Subject:       RE: Cheap Motor drivers [OT]
Date:          Wed, 10 Sep 1997 15:23:29 -0500

>Lawrence,

>.In the past I have used a SGS-Thompson L293D to drive small DC
>motors at 24VDC with a PIC. It is a 4 channel push-pull driver with
>internal clamping diodes. It is a 16 pin package with the capability
>to provide 2 full bridges (thus driving 2 motors). It is limited to
.>.about 600 ma. and needs around 40 ma. to operate. Its current
>price is $2.53USD from Arrow Electronics.

>You can check it out at http://www.st.com.


>-larry-

At $2.53 US each that's $0.63 per H bridge.  I don't think I could
build a discrete H bridge much cheaper.  And $2.53 is the onesies
price.  Looks very interesting.  Thanks!




Best Regards,

Lawrence Lile

1997\09\10@195608 by Cliff Rogers

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>
> 'S ok.  I don't need to handle near that much power.  I'm looking for
> something that will run a motor that uses 200 milliamps at 24
> volts.  I'm trying to avoid building a discrete H bridge cuz
> SOMEBODY has done this before and put it obn a chip.
>
> -
> Best Regards,
>
> Lawrence Lile

Circiut Cellar Ink #83 June 1997 Page 74. Jeff Bachiochi uses an LM18293 from
National. There is a circuit diagram as well.

Cliff Rogers   (Computer Technician)  email  cliffrogersspamspam_OUTusa.net
Absolute Computers Pty. Ltd. Cairns, Queensland, Australia.

1997\09\10@234905 by Andrew Russell Morris

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At 08:39 AM 9/11/97 +1000, you wrote:
>>
>> 'S ok.  I don't need to handle near that much power.  I'm looking for
>> something that will run a motor that uses 200 milliamps at 24
>> volts.  I'm trying to avoid building a discrete H bridge cuz
>> SOMEBODY has done this before and put it obn a chip.
>>
>> -
>> Best Regards,
>>
>> Lawrence Lile
>
>Circiut Cellar Ink #83 June 1997 Page 74. Jeff Bachiochi uses an LM18293 from
> National. There is a circuit diagram as well.
>
>Cliff Rogers   (Computer Technician)  email  @spam@cliffrogersKILLspamspamusa.net
>Absolute Computers Pty. Ltd. Cairns, Queensland, Australia.
>
I'm in the same situation, only I have just 6 volts to work with. Don't
use the LM18293 in any new design. I just visited their web site and the
part is listed as "lifetime buy", which means to me that they don't make
them any more. In my case, it also wastes too much power. It drops up to
1.8 volts on the high side (at 1 amp), but it since it uses bipolar
transistors, it won't be much less at lower currents. I'm looking at a 3
phase MOSFET brushless motor driver from Fairchild, but it costs more than
I want to pay in production quantities. I can't seen to find a 2 phase
(h-bridge) version. I'm also looking at some HEXFET arrays from
International Rectifier.

If someone knows of a low drop (Rds) MOSFET h-bridge, please let me know.

Best regards,

Andy Morris

1997\09\11@090650 by Lynn Richardson

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At 04:19 PM 9/10/97 +0000, Lawrence Lile wrote:
>'S ok.  I don't need to handle near that much power.
Maybe you do... measure the motor resistance and calc the 24V current
through it.  I recommend designing for this current as that's what will
happen when you get a locked rotor or if you step from stopped to full
speed.  You can go light on the heat sink if your driver can sense an
overload and shut down.



---------------------------------------------------------------------------
Lynn Richardson - Design Eng.|WA0ZNL            |Progress Instruments, Inc.
DC - 1GHz, RX, TX 100W, PLL  |WA0ZNL.AMPR.ORG   |807 NW Commerce Drive
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C                            |KILLspamlrichKILLspamspamproginst.com|P(816)524-4442 F 246-4556

1997\09\11@094919 by lilel

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------- Forwarded Message Follows -------
Date:          Thu, 11 Sep 1997 06:36:52 +0200
From:          Tjaart van der Walt <RemoveMEtjaartTakeThisOuTspamwasp.co.za>
Reply-to:      spamBeGonetjaartspamBeGonespamwasp.co.za
Organization:  WASP International
To:            TakeThisOuTlilelEraseMEspamspam_OUTtoastmaster.com
Subject:       Re: Cheap Motor drivers [OT]

Lawrence Lile wrote:
>
> I'm looking for a cheap half bridge driver,
<snip>
> What do you PICsters use to drive relays and small DC motors?

Tjaart sez:

>If you have an old MFM hard drive laying around,

What else are MFM's  good for except parts anyway?

>you can rip off the
>two L293's (quad half bridges 1A plenty volts each) Else you can get
>the National equivalent the LM18293. It takes 5V inputs and is very
>easy to use.

Thanks Tjaart!
Best Regards,

Lawrence Lile

1997\09\11@100407 by lilel

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------- Forwarded Message Follows -------
Date:          Thu, 11 Sep 1997 06:18:18 -0400 (EDT)
From:          RemoveMEXYGAXspamTakeThisOuTaol.com
To:            lilelEraseMEspam.....toastmaster.com
Subject:       Re: Cheap Motor drivers [OT]

Lawrence

{Quote hidden}

Looks interesting. When you get the code written for sine wave PWM
I'd like to see it.  I've got an old project laying around to make an
inverter.


{Quote hidden}

1250A at 1200 volts....wow!  What is it for, Wheeling power between
nuclear power plants?! I guess I don't need anything quite that big.
A 3 watt motor would be fine.
Best Regards,

Lawrence Lile

1997\09\11@101513 by lilel

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>  I'm in the same situation, only I have just 6 volts to work with.
>  Don't
> use the LM18293 in any new design.

Thanks for the tip!  Maybe National is considering a replacement?

{Quote hidden}

If I find one I'll tell you.  At six volts you might get away with
the Telcom TC4426, 4427 or 4428.  Don't believe the data sheet where
it says they will withstand 22 volts.  If you get a spike anywhere
near 16 volts they MORPH into a CROWBAR.  :)  But if you are running
on a battery supply they will probably work great.
Best Regards,

Lawrence Lile

1997\09\11@121259 by David W. Duley

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In a message dated 97-09-10 23:52:43 EDT, you write:

<<
If someone knows of a low drop (Rds) MOSFET h-bridge, please let me know.

Best regards,

Andy Morris
 >>
Hello Andy
How 'bout the National LMD18245?

Dave Duley
V.P. DreiTek Inc.
http://www.dreitek.com

1997\09\11@140526 by Larry Payne

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part 0 91 bytes
Info for the Fairchild part can be found on their web site.
http://www.fairchildsemi.com

-larry-

1997\09\11@142456 by Steve Smith

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Try the LM18200 from National 3A to 50V dc bootstrap generation current sense
output over temp protection logic inputs and almost indestructable !

Cheers Steve.....

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