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LED Oscillating with LM3414HV

Raul Macedo
Prodigy 20 points

Hello,

I am having some troubles in a circuit using the LM2414HV. The white LED is oscillating randomly.

The circuit is here:

-IC1 LED is Nichia NVSW219A-H3 - white

-IC2 LED is Nichia NVSL219A-H3 - warm white

-IC3 LED is Seoul SSC-SZG05A0A - green


The Nichia NVSW219A-H3 white LED is randomly oscillating (It changes it's frequency apparently with no pattern) and I could not find out what is the problem.

Both warm white and green LEDs are working perfectly, with the same frequency and amplitude of PWM.

Can someone figure out what is the problem? Someone ever seen this problem?

If more information is needed, plase let me know.

Thanks.

  • 0
    TI__Expert 3495 points
    Raul:
    Can you tell me the input volatge and the LED stack voltages of those three LED strings? Did the oscillation only happen during PWM dimming? Did you PWM dimming all three LED strings at the same time with the same PWM dimming signal? What was the PWM dimming frequency and duty cycle?
    David Zhang