Re: PMOS in parallel with NMOS
- From: "robertwessel2@xxxxxxxxx" <robertwessel2@xxxxxxxxx>
- Date: Tue, 6 May 2008 22:14:07 -0700 (PDT)
On May 6, 11:31 pm, Tomás Ó hÉilidhe <t...@xxxxxxxxxxx> wrote:
I have a bi-colour LED that has 3 pins. Within the LED package there
are two LED's, and they have a common cathode. Their anodes are
separate.
Oh, and that's a *tri* colored LED (two LED's in a package, three
pins). A *bi* color LED has two LEDs in one package connected in
parallel, but in opposite directions, and so has only two pins. In
the later case you can only get one of the two LEDs to light at a time
(the current flowing forwards or backwards through the device). In
the former you get three colors, since you can drive both LEDs at the
same time to get a third color (IOW it's red if you power one LED,
green if you power the other, or yellow if you turn on both).
If you're using bi-color LEDs, here are a few circuits (with different
tradeoffs) for driving them off a single pin device (although you'll
have to add more current handling ability if I'm understanding your
application).
http://www.edn.com/contents/images/101305di.pdf
.
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