Re: LED array current regulation
- From: DJ Delorie <dj@xxxxxxxxxxx>
- Date: 07 Jun 2008 19:34:40 -0400
To follow up on this - I got my order of LM317s and built a supply
using them - 12 independent 20mA supplies. The bulk voltage drops to
35.5 VDC with an 0.22 amp load (9x11 LED matrix), and a string of 9
LEDs drops 29.4 V, or 3.27 V per LED, leaving 1.25 V for the 62 ohm
resistor and 4.85 V across the LM317s. Even at 3.4 V per LED that
still leaves 3.6 V across the LM317s. I think this will do just fine
for my purposes. Thanks!
Photos: http://www.delorie.com/pcb/uvled/
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