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LP5009: programmable current limitation for each channel

KKF
Expert 4255 points
Part Number: LP5009
Other Parts Discussed in Thread: LM5009, LP5569

Hi, 

LP5569 has a feature to limit the current for each channel individually. Is this also possible with LM5009? 

For example with LM5009, if I use an RIREF to set the global current limitation for all channels to 16mA.
Then if I program one of the OUTn_COLOR register to 0x40hex (25% brightness), the current limit for this specific channel is then at 4mA?  
Is my understanding correct?

Thanks a lot & Best Regards,
KF

  • 0
    TI__Expert 6440 points

    Hi KF,

    Nice to hear you!

    The output current can only be set by Rref, both LEDn_Brightness and OUTn_Color rigisters are used to control 12-bits PWM duty cycle.

    So, for your application, when you program one of the OUTn_COLOR register to 0x40hex (25% brightness), the current limit for this specific channel is still 16mA, and the average current controlled by PWM is 4mA.

    Thanks!

    BR,

    Ives Li