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.

over 7 years ago

0 Kenneth Du over 7 years ago

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

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