Other Parts Discussed in Thread: TLC59461, TLC5945
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.
Kenneth Du replied (in now locked thread):
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.
Follow-up questions:
- Icc3/Icc4, please clarify why the numbers are different as only the Riref resistor has changed (the numbers in the table I assume excludes the actual LED's)
- If we lower DCn (dot correction current register) to say half of the configured Riref, will this also lower the current consumption of the led-driver itself?
- As Icc1/Icc2 will show an increase in quiescent current when led's are off (blank is high), is there a way to reduce the quiescent purely in software? (i.e. I don't want to switch the supply off, nor trying to actively increase the resistance of Riref)
