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Original question:

TLC59116: Parallel output channels

TLC59116： Parallel Channels Output current error

Mars Huang1
Prodigy 120 points
Part Number: TLC59116

Hi,

       If use channel parallel (5ch), each channel current is 120mA, is the total output current 600mA?

      Is there an output error? How to calculate it? Can it be compensated? Thank you

  • 0
    TI__Genius 12915 points

    Hi Mars,

    Yes you can parallel 5 channels to output 500mA. To sink high current, QFN version is recommended for thermal concern, as it have thermal pad and have much better thermal performance. Also to avoid potential oscillation issue, the connection wires between output pins with LED need to be short, to induce less parasitic inductance.

    Every channel is controlled independently. The output error is showed as datasheet section 7.5, max to 8%.

  • 0 in reply to Hardy Wu
    Prodigy 120 points

    Hi Hardy,

    Thank you for your reply, a few more questions.
    1. If there is a 30cm connecting wire between the output pin and the LED, will it cause parasitic inductance? What will be the result?
    2.The output error is showed as max to 8%, is it 1CH? Or is it 15CH parallel total output?
    3.Is there any output error data when the output current of 1CH is 120mA?

  • 0 in reply to Mars Huang1
    TI__Genius 12915 points

    Hi Mars,

    Could you help to share more system requirements for your application? There may have other solution could support it.

    1. Sorry that we do not have a research for how long the distance would cause issue. When channel open, there would have a set up procedure which would cause some ripple. Parallel multi channels would increase the ripple on output net. If there is high inductance on output pin, the ripple may keep oscillate and cannot be stable. There may need a test for 30cm wire to get the conclusion.
    2. This is for one channel. There may have some channel have bigger error than others. But the trend is very possible the same. Like one channel have 2% error while another have 4%, but less possible that one have -4% and another have 4%.
    3. Sorry that we do not have mass test data for 120mA setting.