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LM3410: Drive high-current LEDs through the LM3410

Wesley Lai
Intellectual 290 points
Part Number: LM3410

Dear Sir,

I have a project need 1000 lm or more.

My setting conditions are as follows:

LED : OSRAM LED (Vf 2.7V-3.0V / If 700mA ).

LED Q'ty : 4 pcs LED / 1 serial (the voltage is 10.8V-12V and the current is 700mA).

Power : Li-poly battery (3.7V / 5000 mA).

Dimming : PWM signal from Arduino.

If I use LM3410 to drive it, is it ok ?

If not, please give me some suggestion.

Thank you.

  • 0
    TI__Mastermind 28655 points

    Hello Wesley,

    This will exceed the peak switch current minimum of 2.1A.  At 3.7V input, 12V output at 700 mA the average on time current of the LM3410 would be 2.35A.  This is including 0.4V for the boost diode.  This does not include current ripple or efficiency.  This part doesn't quite have the capability you are looking for especially if your input voltage can drop.  You can try it knowing this limitation.  Note that your design will need low inductor current ripple and will need good heatsinking for the LM3410.

    We don't have a part for low input voltage and higher output power like this.

    Best Regards,