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Whats the best solution for driving 4 white LEDs?

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moda

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3v supply for driving white leds

cheapest, high efficiency, best solution that you know/think of, for driving 4 white LEDs @

1.6v drop & 3mA,

Vin=3v from a battery

We can connect the leds in any combination that we like.


The most important is power (not just 4 leds in parallel = 12mA) and cost,

Thank you

Moda
 

Re: Driving 4 white LEDs

If you connect each led in series with a 470 Ohm resistor, and in parallel with each other, you obtain your requirements.

Regards, Helder Silva
 

Re: Driving 4 white LEDs

You can implement churge pump converter, such as LM2623 (**broken link removed** ), generate 4*1.6V=6.4V of 3V with >90% efficiency and supply all 4 LEDs connected in series (3mA current) of this 6.4V ..
 

Re: Driving 4 white LEDs

I'm sorry, I didn't understood your question, that was the reason I've sent that answer.

Regards, Helder Silva
 

Re: Driving 4 white LEDs

u can use any current driving IC in conjunction with a 180ohm resistor for ur requirements. use a transistor like C1383 , or C945.
 

Driving 4 white LEDs

upconvert the supply power to 6.4V and connect the LEDs in seriel is the low cost way, only 3mA power consumption.

But you need a upconverter IC
 

Re: Driving 4 white LEDs

check out supertex or maxim. there are many chips out there for current regulation as they current devices. you can use a resistor but there is no compensation for input voltages swings.
 

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