31 Oct
2011
31 Oct
'11
1:19 a.m.
2011/10/24 Shoppa, Tim <tshoppa at wmata.com>
Ahh yes I see.
So if you multiplex 8 leds you need 8 times the peak current to keep the
same luminance ?
Regards
Benjamin
--
Med venlig hilsen / Best regards
Benjamin S?lberg
Why are the
LED drivers so difficult to make, is it because of the
'high' (a few mA)
current ?
Most of the handheld devices of the 70's used multiplexed displays (well,
still true today) and while the average LED current might be a few mA per
segment, the peak current in the drivers could be ten times higher.
Some of the intended-to-be-driven-by-PMOS-driver-chips of the 70's are
still around today and put to other good uses. e.g. ULN2002.