> > Looks good, except that R229 works against the pull-up in the > FPGA, which probably works but looks a bit ugly. How about > making R229 a pull-up, too ? > > yuh, after chatting in irc, I'll change R229 to be as an pull-up, tks.
> > D1 is fully ON, If = Ids = 9.67mA when I simulated LED_PWR net(i.e. > gate > > pin of Q3) to connect 3.3V net [ simulated a pullup ] > > How did you simulate ? Qucs ? > Through my fingers and held extendable wire from gate pin of Q3 to touch 3.3V and GND. ;-) > > dark --> no power/disabl , do you know which current pulled out fpga pin > > Nominally zero ? Not sure if I understood the question. > > No need this now. ;-) > > so I think that I need to detemine R41 value from your current flow of > > LTST-C190KRK (off-ledm circuit example from circuit R42 you there), then > I > > fine trun same current with resistance (my site here) to get an expected > > brightness. > > How do you think? > > Yes, sounds good. I just saw that I have a few APT1608SURCK. That's > the same junction as in the diode we want to M1r4. Maybe I'll give > it a try ... > good, later let me know. :) > > If Q3.Rds(on) << R41, then R41 should be equal to R42. And, given > the date we have so far, both should be around 560 Ohm. I.e., you > can change "TBD" to "560 Ohm" :) > Q3.Rds(on) = 5 Ohm << R41, okay, let it be also 560 Ohm, tks. - adam
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