hi everyone
I wanna light three LED with ( 2.3 Vd (on) , 200 mA , 1watt)
but i just have a rechargeable battery ( 3.7 V and output current around 100 mA)
would you help me how to drive these LEDs?
thank u

 

Hello,

The leds are about 0.5 Watts given the voltage and current.
You say that the battery can deliver 100 mA. (or do you mean the capacity of 100 mAh? )
I assume it is a lithium battery, looking at the given voltage.
When the battery can deliver only 100 mA, you can not drive the leds.

Bertus

 

Hello,

The leds are about 0.5 Watts given the voltage and current.
You say that the battery can deliver 100 mA. (or do you mean the capacity of 100 mAh? )
I assume it is a lithium battery, looking at the given voltage.
When the battery can deliver only 100 mA, you can not drive the leds.

Bertus

thank u so much for your attention
first of all , i'm amateur in this field )
in fact i can use a battery with 600 mA output current but i'm trying to reduce my expenses for this project

NO i mean exactly 100 mA , in higher output current this battery get out of charge really fast and it's output voltage decrease in about an hour .
i think that using transistor is the answer , Am i wrong?

 

Hello,

You can not draw 1.5 watts from a battery that can deliver about 0.4 watts.
There is no way to get more.

Bertus