Hi:

I'm looking at powering some 1 Watt LEDs using a ZXLD1350 that has a 
maximum input voltage of 30 Volts from a battery that might be as high 
as 32.8 Volts when fully charged.  I'm trying to come up with a way to 
keep the voltage at or below 30 volts without wasting any more battery 
power than necessary.  One way would be to use 5 diodes in series with 
the battery input then when the voltage gets down to 30 short them out.

Or is there another IC with equal or better efficiency (>90% from 20 to 
30 Vin) when driving 5 each 1 Watt LEDs (340 ma @ 3.3V) that has a 
higher input voltage rating?

Have Fun,

Brooke Clarke

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