RE: [CAD_CAM_EDM_DRO] High voltage protection for a breakout board.

Hi Arturo,

How about 80VDC? That’s what and opto-isolator is designed to isolate
against. A buffer will help if the drive current (from, say, a laptop) is
weak. I haven't heard of any need for a bidirectional buffer.

I've built four driver/PS boxes, and haven't found the need for a breakout
board. My Geckos have opto-isolation already.

Alan KM6VV

> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Arturo E. Duncan
> Sent: Wednesday, May 04, 2005 10:29 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] High voltage protection for a breakout board.
>
> Group,
>
> I have been working a design for a new breakout board for general use
> in cnc applications. The new design is based on the SN74LV245AT IC,
> wicth acts as a bi-directional buffer and has ESD (Electro Static
> Discharge) protection for up to 2000V. I have been hoping to
> eliminate the opto-isolators with the use of these IC, and will
> greatly reduce the number of parts and simply assemble, thus enabling
> the possibility to reduce the cost of the final product.
>
> I know for most interfacing applications this IC is a great buffering
> device, but ¿would it be good enough protection from a possible
> failure of a stepper driver?
>
> The datasheet for this IC can be found at :
> http://www.cnc4pc.com/Tech_Docs/sn74lv245at.pdf
>
> Thanks,
>
> Arturo Duncan
>