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Using only one channel at a time of LP8556

Brian Hemphill
Prodigy 10 points
Other Parts Discussed in Thread: LP8556

Hello,

  I would like to use the LP8556 with 6 LED strings, but with only one string on at a time (could be any of the 6).  Can I do this by setting PS_MODE to '000' then adjust LED_EN according to which string I want on?  The data sheet recommends that if strings are disabled they are higher order ones, but doesn't say that's a requirement. This also implies altering the pre-configured register settings on a regular basis, which I'm not sure is OK.

Thanks,

Brian

  • 0
    TI__Expert 4565 points

    Hi Brian,

    Your understanding is correct. If PS_MODE is set for 6 string operation, you can change LED_EN to control individual channel enable.

    The recommendation to disable from high LED channels came from phase shift operation decided by PS_MODE is preset to disable high number channels first, but in your case(enabling individual LED channel), it shouldn't make any difference.

    Hope this helps,