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TLC5924: TLC5924 Parallel outputs question.

Moises Dominguez
Prodigy 145 points
Part Number: TLC5924

Hi,

I'm wondering if it is possible to use the TLC5924, to drive 2 LEDs that required  600mA each.

Using a external resistor of 620 Ohm will give 80mA output per channel:

Is it possible to parallel 8 outputs for one LED, and the other 8 outputs for another LED?? 

I will have resonance oscillation problems due to many outputs paralleled together?? 

Also, If this is not possible, can you recommend another TI part that allows me to Drive a LED with more than 600mA upt to 1A if possible with SPI interface. I've been checking TI's catalog without success.

Here I show how I was planning to do it:
:  

Thanks in advance,

Moises.

  • 0
    TI__Genius 11836 points

    Hi Moises,

        It's OK. Pay attention to the wire length of OUTx to LED. You will have a risk to meet resonance oscillation problems due to long wire from Outx to LED.

  • 0 in reply to Charles-Chen
    Prodigy 145 points

    Hi Charles,

    Thank you for the answer,

    the nature of my application is as follows:

    I will drive some mounted LEDs ready to couple with a fiber optic. The driver output will go through a connector and then to the mounted LED, they have a special packaging for heat dissipation and  fiber coupling,  so for sure the wiring becomes somehow long. After reading your answer, does this represents a problem then ? 

    Thank you.

    Moises

  • 0 in reply to Moises Dominguez
    TI__Genius 11836 points

    Hi Moises,

        The final result depends on the value of the parasitic inductance of your connection wire. I can not give you a definite conclusion. But you will have a risk to do so. Therefore, I suggest that you should test it firstly using the actual wire in your application.