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Thread: LED Driver Sink Current

  1. #1
    Join Date
    May 2017
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    Brazil
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    LED Driver Sink Current

    Hello all. Thanks for taking up your time to read my post.The specs of TI TPS75105YFFR LED driver as the datasheet of http://www.kyniix.com/uploadfiles/pd...S75105YFFR.pdf says "constant current sinking" capability is 60-mA.(LED Power supply voltage up to 15 Volts, and Vcc=3.0V to 5.5 V )My understanding is if Sink current is low, then its better as it will not heat-up my LED driver chips.1- I want to understand What is the importance of High (or Low) LED driver Sink current?2- Why we do not talk about sourcing Current instead?Any comments?
    Last edited by Jraef; 05-23-17 at 10:37 AM.

  2. #2
    Join Date
    Apr 2008
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    Ann Arbor, Michigan
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    170519-2138 EDT

    neoply:

    I took a quick look at the datasheet. I don't want to study it in detail.

    From the diagram I would call it sourcing rather than sinking.

    It apparently provides constant current sourcing, and intensity adjustment (obviously meaning current adjustment).

    .

  3. #3
    Join Date
    May 2014
    Location
    AZ
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    1,759
    it is a current source (high side switching, anode). its a switch, etc.
    led mA range is 3-25mA
    Vin MAX -0.3 to +7 (not 15v)
    the chip has a thermal pad
    it also has limited power dissipation control.
    the DSK package will create about 1w of heat (max), which can be a challenge to control chip temp if the chip is confined in small tight space
    less amps running through it, less heat it makes.

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