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LM3410: Testing my board with this chip

Connor Redding
Prodigy 20 points
Part Number: LM3410

I was attempting to test my board more "locally" however I experienced immense heating when I did so. I hooked up a 3.7V Li-ion battery to Vin and GND, the rest of the circuit as is in the application sheet, and a power supply at 2.5V to the DIM pin, along with the power supply's GND to GND. The LEDs powered on and maintained the correct voltage flawlessly, however the power supply immediately read that it was pulling .6 A. The board quickly heated up. I then current limited my power supply to .03 A, the DIM pin pulled ~.9 V, and still maintained the LEDs brightness. Is there something wrong with my testing methodology? I can't for the life of me find anything wrong with my circuit and upon in depth testing all relevant component values and continuities are correct. I can post my eagle files and schematics if that would help.

  • 0
    TI__Mastermind 28655 points

    Hello Connor,

    I would like more detail on more 'locally' and what is actually connected to your circuit.  You are providing power from a battery, 3.7V.  What is your LED stack voltage?  Is this a boost converter?  Did you apply the DIM voltage before connecting the battery voltage?  I would check all of your connections and order of applying voltages.

    From the datasheet:  "Dimming & shutdown control input. Logic high enables operation. Duty Cycle from 0 to 100%. Do not allow this pin to float or be greater than VIN + 0.3V."

    Best Regards,

  • 0 in reply to Irwin Nederbragt
    TI__Mastermind 28655 points

    Hello Connor,

    I haven’t heard back from you, I’m assuming you were able to resolve your issue.
    If not, just post a reply below (or create a new thread if the thread has locked due to time-out)

    Best Regards,