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LM3434SQ-20AEV: Minimum output current of Led Driver

Yutong Jiang
Prodigy 10 points

Part Number: LM3434SQ-20AEV

It says in the data sheet that minimum current output is 4A and when we measured we got 3.8A when the LED terminals were shorted.

We'd like to know if and how we can get a current output of 1A-2A. 

  • 0
    TI__Mastermind 25500 points

    Hello Yutong,

    That board was designed for very high currents. But getting lower currents is pretty easy. Instead of using 5mohm total for R15 you can use 50mohm and the maximum current would be 2A rather than 20A. That design is a little overkill as is for 2A (you could remove parallel FETs for such a low current and maybe a bit more), but it will work great either way. You might want to use a much smaller inductor with a higher inductance which would reduce the ripple and be lower cost if that's a concern. At 2A max you could also use a higher switching frequency rather than increasing the inductor value. Do you need the common anode feature? We have other much more simple options for buck LED drivers if that is not a requirement. If it is then the LM3434 is a good choice.

    Best regards,

    Clint