Re: Was Chopper circuit - Now ver 3.2

--- In CAD_CAM_EDM_DRO@y..., Steve Blackmore <steve@p...> wrote:

> On Sat, 06 Apr 2002 22:06:54 -0000, you wrote:

[snip Mariss' comment on TL83C]

> I'm currently on Ver 3.2 - I've tidied the circuit up a bit,
> moved a couple of components around slightly to help with
> heat sinking and put a parts list in. The overlays are back
> in wmf format - they are nice and small with no loss of quality.
>
> Latest is now http://www.pilotltd.net/chopper32.zip

The BYW29E 8 Amp diodes still seems like overkill to me,
but as long as you can get them and they are not too
expensive, it probably does not matter. You should be
able to run all the way up to 46V, with the BYW29E's.

> Somebody asked me about an even higher current version
> for motors with 4-7A per phase - I can't find a one chip
> solution, I assume it's gonna need the L298's replacing
> with some beefy mosfets or could they simply be tagged
> on to the outputs from a 298?

I don't know of any single chip solution up in that
power range, but I'm kind of a newbie to all of this.
I suspect thermal run away problems will doom any
attempt to gang together muliple bipolar solutions
like the L298 up at that power range. However, it
may be possible to gang together two or three MOSFET
solutions like the LMD18200 and get away with it.
I suspect just building an H-bridge out of beefy
MOSFET's will be cheaper tho'.

-Wayne