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TLC5944: Optimizing power consumption (VCC), with all LED's off

Dav01
Expert 2300 points
Part Number: TLC5944

Hi, I'd like some input on how to read the supply current specs for the TLC5944 led driver.

  • Can I assume that Icc3/Icc4 in the datasheet (picture below) is without any LED's "on"?
  • Why does Typ/Max increase together with Riref?
    • it seems to have a relation with the constant current setting
    • please clarify what can be done to reduce the current consumption unrelated to actual sink led-current.

  • 0
    TI__Genius 14295 points
    Hi, Dav01,

    Icc3/Icc4 is with LEDs all on of full greyscale while Icc1/Icc2 is without any LED's ON since BLANK is high.

    Rief changes the Reference Current in IC and will cause Typ/Max's cahnge. You can refer to the function block diagram.

    Hope it helps.

    Thanks.

    Regards,
    Kenneth