On Mon, Dec 14, 2015, at 10:51 PM, Gene Heskett wrote: > On Monday 14 December 2015 19:11:49 Jerry Scharf wrote: > > > Hi, > > > > Just did a super quick google search and came up with a fairchild > > optocoupler hcpl2530 that will do 1Mbps. ~1.80 USD quantity 1. > > Isolation to 480v and good common mode rejection. There are a number > > of devices in similar and better speeds. > > > I was wondering if faster stuff was filtering down into the afordable > category in the last decade, But only 480 volt isolation? that would > have to be mesa isolated on the same substrate, edge emitting diodes > facing edge sensitive transistors. I think it depends on the environment > if thats enough isolation. With noise from higher speed/volatge stepper > drivers nearby, I'd be a tad nervous.
"Only" 480V? Jerry wasn't saying "these devices fail at 481V". They are UL approved for use as isolation between 480V power systems and low-voltage control. The actual isolation rating is far higher than that. The hipot test spec is 3750V RMS for 1 minute. Optos are getting pretty good these days. At work I use the Renesas PS9924, an extra-wide body one that can meet safety regs at 690V AC, even at high altitudes where thinner air requires larger clearances. Hipot rating is 7500V RMS! Sub-100nS prop delays, easily handle 5MHz data. Cost is still under $10 each, $5 in quantity (a bargain if you need such performance). Datasheet: http://documentation.renesas.com/doc/YOUSYS/document/r08ds0059ej0100_ps_family.pdf -- John Kasunich jmkasun...@fastmail.fm ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
