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TLC5941-Q1: About LED brightness settings

Kaji@PAN
Mastermind 7145 points
Part Number: TLC5941-Q1

Hello,

I'm considering TLC5941-Q1.
The circuit I created has the following problem:
LED24 and LED27 have different brightness, with LED24 being brighter and LED27 being darker.
When observing the voltage of OUT10 (LED24) and 11 (LED27), the following waveform was observed.
The difference in the brightness of the LED seems to be the difference in the voltage level when the LED is lit.
What settings should I make to make the LED dimly light like OUT11 (LED27)?

Best regards,

  • +1
    TI__Genius 11176 points

    Hi Kaji,

    What's the Vf of the LED24 and LED 27?

    Pls make sure the voltage on OUT pin is larger than the headroom voltage needed. From datasheet, VOUT should be at least 1V to output 60mA.

    So you may try to remove the resistor on the channel.

    BR, Gracie