0-10V dimming solution based on LM3414

Bill Chan

Other Parts Discussed in Thread: LM3414

Hi there,

I am working on a 0-10V dimming solution based on LM3414 to drive a LED string. I understand that I should use the DIM pin of LM3414 for dimming the LED string. Unfortunately there did not exist an UL approved 0-10V dimming driver for this kind of application. Nevertheless I did an experiment by hooking a 0-10V constant voltage dimming driver to the LM3414 without connecting to the DIM pin. The output of 0-10V dimming driver feeds a 24V PWM signal to the Pin 8 (VIN) of LM3414. I found that the LED string could be dimmed by varying the control voltage of 0-10V wall box dimmer switch without flickering. Is it OK to feed this 24V PWM dimming signal directly to the Pin 8 (VIN) of LM3414 for extended period of time without damaging the IC?

Cheers,

Bill

over 9 years ago

0 David Zhang over 9 years ago

TI__Expert 3495 points

Bill:
It won't damage the IC. I am not sure if the 0-10V dimmer can be connnected this way.
David Zhang

0 Bill Chan over 9 years ago in reply to David Zhang

Prodigy 20 points

Hi David,

Good to learn that the IC won't be damaged. Yes the 0-10V dimming driver could be connected in the way I described before. I could dim the LED string by varying the 0-10V dimmer switch without flickering. The LED string produced about 10% of max lumen output at 1V, and there was no flickering or slow pulsating. Everything looked fine in this connection. Does it mean that I can use the LM3414 in this way? Please advise your thought.

Cheers.

Bill

0 David Zhang over 9 years ago in reply to Bill Chan

TI__Expert 3495 points

Bill:

Yes, LM3414 can be turned on on off by input voltage without damage.

David Zhang

Power management

Power management forum

0-10V dimming solution based on LM3414