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Control LED from Teensy uC

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andrew_c:
Hi all, I need to control a 24Vdc Tricolour-LED from a Teensy 3.2 uC (3.3V). Unfortunately I need to switch the high side as it has two anodes and a single cathode.

I would like to get away with as few components as possible (space is really tight) but I don't see any other way than a NPN controlling a PNP transistor (please forgive the lack of any missing resistors in the drawing).

Each of the LEDs is rated for 20mA. Is there any other way I can do this?



Thanks,
Andy

spec:
Hi andrew_c,

Would advise to change your circuit as per the attached image. :)

andrew_c:
Hey there, made a few changes immediately after I created the post. I really would love to magic something simpler out of thin-air though.

spec:
Yes, I noticed- had me a bit confused at first :)

Would a single chip be acceptable to drive the two LEDs. Is that what you are after?

Meantime, I have reduced the count to 3 components per LED as per the attached image.

For Q2 you need an NMOSFET with an input threshold of around 1V.

Some suitable NMOSFETS are:

BSN20BK
PMF370XN
EN2550
CSD17381F4
CSD17483F4

andrew_c:
A single chip would be excellent!! Please, what do you have?

P.S. Nice and simple schematic non the less.

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