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Re: LED string current balacing IC

 

The closest thing I've seen to what you need is a TLC5947. Single chip, needs just a current-setting resistor, etc. Unfortunately they can only drive strings up to 30V (with a 5V supply). Maybe you can use your 55V supply and transistors to drive your strings with a chip like that.

--- In Electronics_101@..., "sanmeeth" <sanmeeth@...> wrote:

Im looking for a LED string current balancing IC without success. Does anyone knows of such an IC and point me to the same or some manufacturer who might be manufacturing such an IC?

Requirement: I want to drive multiple LED strings @ 25mA. The LED string forward voltage is 50V to 52V. I would use a 55V power supply. The IC should be able to regulate current (25mA) through multiple strings using PWM.

Long back, I'd seen such an IC from a chinese product. It didnt require any inductor/capacitor etc, but only one current setting resistor. I require a similar IC but couldnt find one yet. Anyone seen some like that?

Sanmeet
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