l4960
Hi,
Anybody know good design for feeding high power leds like 1w star?
The first question rises what is the best current / voltage design to feed lets say 6 or 12 of these leds, if you make 6 series in two rows for example 22.2 volts / 0.7A, or with 2 leds 6 rows, 2.1A, 7.4v ???
To make a battery powered design with high efficiency, must use PWM or switch mode converter, for sure, but which of them?
I already tried LM2576, which has a eff of %65-70, vwry low! Also tried L4960 which has %80 eff also seems to be low.
Have UC3843 in mind now but could not find a good solution or example as a start, because UC3843 design is not simple as the others, some mid-advanced feedback is required I think. I found few ideas but all depend on voltage regulating rather than current. No isolation is needed but if the input range is wide lie 8-36v with high efficiency it will super!
Have any idea?