Re: Question For Dan Mauch

As you may know I have been using the L297/L298 combo for nearly 5 years. I
have also been using the Superior electric D200 which is similar. I designed
a PC board to fit this module and have a three and four axis version. The
module will go to 2.5 amps. You can set the current anywhere from .5 to
2.5Amps. I am using a 36VDc supply with it. They run great. I was running my
full size mill with 450 oz in motors with them for two years before
switching to servos.
The D200 does not lend itself to simply adding mosfets to the output because
you would loose the current sensing in the choppers. Since they are sealed
there is no way to connect the sense resistors. That is why I chose the
ericsson 3776 chip for my 5 amp chopper. Coinsidently, Kevin Carol was also
working with this chip and we both found it superior to run descrete
mosfets.
Dan

-----Original Message-----
From: William Scalione <scalione@...>
To: CAD_CAM_EDM_DRO@... <CAD_CAM_EDM_DRO@...>
Date: Saturday, May 29, 1999 5:55 PM
Subject: [CAD_CAM_EDM_DRO] Question For Dan Mauch

>From: William Scalione <scalione@...>
>
>Dan, or anyone else who might know;
>
>Have you ever tried to use an SGS Thompson GS-D200? It is basically a
>L297/L298
>with most of the glue components in one module. Add a couple resisters,
>a current limiting pot and some wire and your done. What I was wondering
>about was
>since the output is only 2 amps could those outputs be run into some
>high power
>transisters to acheive approx 10 amps. If so how would the current
>limiting be
>accomplished? Design so the gain of the output transisters is approx. 5
>then
>adjust the current limiting pot on the GS-D200 (or L297/L298 combo) to
>equal 2
>amps at the output of the H-Bridge (2A * 5 = 10A)?
>
>Thanks
>
>Bill
>
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