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Topic: constant 12v and constant 200mA from a li-ion battery for led (Read 957 times) previous topic - next topic

hi
I want to make a circuit to drive 24 LED in a 4 series 6 parallel configuration.
i have a 3.7v  4400mAh or 7.4 2200mAh li-ion battery. To drive these led in this configuration in a very power efficient way i need 12v with minimum current of 200 mA

i tried a few circuits  but they are very less power efficient due to resistive loads and the voltages and current  values for the led are also very fluctuating.

is there any method of driving LED in a power efficient manner with such specification.


MisterResistor

Do you really need 12 volts? Your 2 batteries in series would only give you 11.1 volts.

sonnyyu

#2
May 07, 2013, 02:22 pm Last Edit: May 07, 2013, 02:27 pm by sonnyyu Reason: 1
You need boost LED driver IC, since Vin<Vout.

Sample IC-FAN5333



0.94,digikey

FAN5333 support Arduino dim the light.


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