Alt-BEAM Archive
Message #01424
To: beam@corp.sgi.com
From: Terry Newton wtnewton@nc5.infi.net
Date: Wed, 10 Mar 1999 03:02:38
Subject: [alt-beam] Re: Surface mount H-bridge chip
At 07:09 PM 3/10/99 +1300, Justin wrote:
>Strange that he used the ZHB6718 instead of the 90, when the ZHB6790
>seems to allow much more current. Ah well, I can think of several
>reasons why this might happen. I've used HC245's for drivers instead of
>AC245's, I guess that's the same thing :)
According to the specs I had at the time (the Digikey catalog) they
were both rated at about 2 amps. The PDFs I just got from www.zetex.com
mostly confirm this - 6718=1.5 amps, 6790=2 amps, have to heatsink to
get that. The resistor sizes I use (1K range) limit the current to a
few hundred ma anyway so how many amps over that makes little difference.
The 6718 was listed as having a bit more guaranteed gain so with no
other selection pressures I picked that one... guess I'm strange!
Terry Newton
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