I am trying to find a circuit that will help me to build a constant current regulator to drive 10.2V,2.34A rated high power led. I will power this circuit with 12Vdc.
Can anyone recommend me a dc/dc converter IC for this circuit ? or schematic ?
Re: How to drive Lamina high power LED with 10.2V,2.34A rati
Depending on which option suits you better, you can build constant current circuit based on PNP (source, picture 1) or NPN (sink, picture 2) transistors ..
In the first case the current can be calculated as: I = Uz/R1, in the second case I = Uz/R2 ..
In both cases you will need to select power transistors which can handle current of at least 4A ..
Re: How to drive Lamina high power LED with 10.2V,2.34A rati
Hi
You will need a BUCK switch type regulator with current sense resistor in the feedback loop
Select the resistor acording to the feedback voltage needed by the loop and if the resistor became large (<0.5 ohm) you will need to use a smaller resistor and amplify the sampled voltage