Other Parts Discussed in Thread: LM3414HV, LM3414
Hello everyone, I bought the LM3414HVREVAL board to test the LM3414HV chip because I want to use it for a project of LED driver. I found some issue with the PWM dimming frequency that confused me, please can you help me?
The issue is:
- With a PWM frequency from 200Hz to 400Hz at 70to80% of duty cycle the LED flicker a lot and this is unacceptable;
- With a PWM frequency higher that 1kHz instead the LED works great and no problem found when dimmered.
So I don't know how this can happen, on the datasheet of the component LM2414HV there is:
" To ensure normal operation of the LM3414/HV, TI recommends setting the dimming frequency not higher than 1/10 of the switching frequency..."
And this is exactly what I've done. Could you please help me with this issue?
I want a PWM frequency from 200Hz to 400Hz because most of commercial dimmer work at this output frequency.
