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LM3466 COMM pin

Martin Anker
Prodigy 10 points
Other Parts Discussed in Thread: LM3466

Hi,

we are using the LM3466 to balance the current of 4 LED strings. The LM 3466 are located at different LED PCB's and are connected together with a bus PCB.

My question is:

What happens if we do not connect the COMM Pins together?

Do we absolutly need the connection bus for the COM Pins?

Regards Martin

  • 0
    TI__Expert 3920 points
    Hi Martin,Please refer to the datasheet describing the COMM pin as below:
    Communication Pin (COMM)
    The COMM pin serves as a communication link among all LM3466 in the lighting system. It also indicates the
    status of the device. The COMM pin is pulled low at startup. After startup, the COMM pin is high or low to
    indicate that the corresponding LED string is active or inactive.
    For proper operation of an LM3466 lighting system, the COMM pin of all LM3466 should be either shorted
    together or connected through a diode in parallel with a resistor.Thank you!
    Best Regards,Issac.