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Original question:

LM3410: Separate “VIN” and " regulation voltage(VREG)"

LM3410: DRIVER DOESN'T WORK

raz2121
Prodigy 50 points
Part Number: LM3410

HI i made this circuit: it has 6 led in series. there are 6 rows of them, so 36 led totally . Total 300mA current.

I made the pcb and tried but it doesn't work. Any problems on my circuit? I respected the diode polarity and checked several times. They don't turn on even with 100% of PWM. I used 9 khz PWM. Input VIN is 3.3V. R1 is 0.62ohm

I will appreciate your help

  • 0
    TI__Mastermind 25500 points

    Hello,

    Have you probed DIM to make sure it is above 1.8V? I also cannot see what is erased, is there something on your board for OVP? Either way have you probed FB to make sure it isn't pulled high? It will not switch if FB is pulled high.

    Have you verified that there are no solder shorts between pins or cold solder joints? I do not see anything wrong with the schematic so is likely something like that.

    Regards,

    Clint