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How to get Constant Current output using Constant Voltage Driver ?

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sanks85

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Hello Guys,

I am using a constant voltage driver (MAX: 45W) to drive RGB Leds (low power) .

Now i need to drive High Power Leds and for which i have to use Constant current driver.

I thought to use LT3956 which could convert constant voltage to constant current output , but the problem is that it has only one channel.

Where as i need RGB channels in the Output.

Any help shall be appreciated

Thank you very much.
 

I think you are going to need 3 of the Lt3956 if you want to control the different colors seperately.
 

Dear sanks
Hi
Why not an SMPS ? for example a simple flyback converter . ( in current mode topology ) . it's out put current can't exceed from authorized value .
BTW : what do you mean by constant current ? are you referring to a current source ? or just limited current ?
Best Wishes
Goldsmith
 

The LT3956 seems to be overkill.

Do you know of the common trick of using a three-terminal voltage regulator as a constant current source?

The circuit, below, maintains its design voltage across the series R. By a suitable choice of the regulator's voltage and the value of R you can set the current to whatever you like up to the regulator's maximum value.

constantcurrentsource.gif
 

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