Vern Graner
08-09-2005, 06:26 AM
Ok, either I'm not reading the right sheet (http://www.rentron.com/Files/uln2803.pdf), or something.. but I can't seem to find what the total maximum current draw is on the ULN2803a. I know it is mentioned that you can sink 500ma per channel, and there are 8 channels, but does this mean I can sink 500ma per channel on ALL channels at the same time? http://forums.parallax.com/images/smilies/confused.gif
If so, that would mean I'd be passing FOUR AMPS through that little chip. I imagine the trace size on the PROP-1 may play into this equation as well? Anyway, is there a maximum current draw when all channels are driven at the same time? FWIW, I am trying to set up a PROP-1 to control a 24v motor at up to 1amp of current.
Vern
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Vern Graner CNE/CNA/SSE | "If the network is down, then you're
Senior Systems Engineer | obviously incompetent so why are we
Texas Information Services | paying you? Of course,if the network
http://www.txis.com | is up, then we obviously don't need
Austin Office 512 328-8947 | you, so why are we paying you?" İVLG
Post Edited (Vern) : 8/8/2005 11:42:15 PM GMT
If so, that would mean I'd be passing FOUR AMPS through that little chip. I imagine the trace size on the PROP-1 may play into this equation as well? Anyway, is there a maximum current draw when all channels are driven at the same time? FWIW, I am trying to set up a PROP-1 to control a 24v motor at up to 1amp of current.
Vern
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Vern Graner CNE/CNA/SSE | "If the network is down, then you're
Senior Systems Engineer | obviously incompetent so why are we
Texas Information Services | paying you? Of course,if the network
http://www.txis.com | is up, then we obviously don't need
Austin Office 512 328-8947 | you, so why are we paying you?" İVLG
Post Edited (Vern) : 8/8/2005 11:42:15 PM GMT