Hi, my application requires driving 13 UV LEDs with maximum forward voltage of 7V. I am looking at TPS61194 as a potential LED driver chip. Because I have 13 LEDs to drive, I have to have 3 LEDs on 3 of the driving channels and 4 LEDs on the last channel.
My input voltage range is 6.8V to 8.3V, and I need to drive each channel at 40 mA (there is also a possibility of increasing the drive current to 60 mA in my application).
My question is, would I be able to have an uneven number of LEDs on my channels (essentially one channel with maximum 28V drop and the other 3 channels at maximum 21V drop) and still get current matching to a reasonable degree? Would I take a hit on efficiency?
As a side note, I have thought about adding a resistor in series with the channels with 3 LEDs that would match the forward voltage drop of a 4th LED at the desired current, but this seems wasteful. I am hoping I don't have to do this.
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