MPQ3323B’s dimming register has 4 identical register addresses for each channel.
I don’t know which register to adjust.
I’m confused because it doesn’t seem to work proportionally as the formula says even if I adjust only the first register.
Is there an example of register settings?
I set DPWM to about 160mA and tested it so that channel 4 operates. After some time, it flickers. Is this another problem?
I understand that since there are 4 hardware pins per channel, it matches 1 pin per register. Through testing.
Then, it is expected that there will be a total of 16 FET switches inside.
When controlling, it is expected that the hardware will not be overloaded if the values are evenly distributed to the 4 registers.
Finally, the problem that caused flickering was that the first channel tested was the Red channel among RGBW.
Since the Vf of the Red LED was relatively low, abnormal operation occurred at the LED Short Protection default value of 3V.
It was resolved by changing the LED Short Protection register value to 4V.
Hello @ktbae,
Apologies for the late response. Glad you were able to figure out the LED SCP threshold setting was the root cause of your problem. You can also change the threshold (Vslp) by changing the STH[1:0] register in the datasheet.
Let me know if you have any questions.
Best,
Saquib
