Actually, the converter would be more efficient, since it transfers(converts) 90% of power whereas resistors would transfer only 40%.
But as you said 6W is not that much, so for simplicity's sake I'll just use 12v supply
Thanks for your help Rob!
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Actually, the converter would be more efficient, since it transfers(converts) 90% of power whereas resistors would transfer only 40%.
But as you said 6W is not that much, so for simplicity's sake I'll just use 12v supply
Thanks for your help Rob!
The most efficient would be boost LED current controller but it is probably a waste of effort to control just a few LEDs.
I am not sure they are made in anything larger then SOT or SOIC sized packages.
Do you mean PWM base driver? I planned to use one for brightness control on the back-lighting LEDs by pluging it into the +12 Bus for the whole MIP.Quote:
Originally Posted by Leo Bodnar
It's similar to DC-DC converter but instead of regulating voltage it regulates current. There are buck and boost varieties. Efficiency is usually 85-95%. There are literally hundreds of them. Here is a random pick from the ones I have personally used.
http://www.fairchildsemi.com/ds/FA%2FFAN5331.pdf
R1 and R2 are actually for current measurement - they dissipate almost nothing so 0.125W is fine. Overall efficiency is about 90%.