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TLC6984: Line scan switch load current - per-line or total?

Derek Payne
Mastermind 33800 points
Part Number: TLC6984
Other Parts Discussed in Thread: LP5891, LP5891-Q1, TLC6983, LP5890

Is the 2A line scan switch load current per-line? Or a sum total for all active lines?

  • +1
    TI__Mastermind 23245 points

    Hi Derek,

    The 2 A is the maximum line scan switch load current (I_LINE) that each line-scanning FET can withstand.

    I_LINE = sum(all channel currents) / scan-number.

    For example, if you are going to use four TLC6984 stackable with 64 multiplexing to support 192 × 64 LEDs or 64 × 64 RGB pixels with 20mA maximum channel output current. Then the I_line = 192(channels) * 20mA / 64(scans) = 60mA < 2A. In such a case to drive 192 channels with 20mA maximum channel output current, you should avoid using scan-number = 1, because the I_line = 192(channels) * 20mA / 1(scans) = 3840mA > 2A.

    The same rule applies to TLC6983 / LP5890 / LP5891 / LP5891-Q1.

    Best Regards,

    Steven

  • 0 in reply to Steven Li
    TI__Mastermind 33800 points

    Thanks for the answer, and the confirmation about similar devices. Appreciate the help.

  • 0 in reply to Derek Payne
    TI__Mastermind 23245 points

    Hi Derek,

    You are welcome. I am going to close this thread.

    BR,

    Steven