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TLC5971: LED Driver - PWM Driven MOSFET Array

Rav Kal
Prodigy 80 points
Part Number: TLC5971
Other Parts Discussed in Thread: TPS54200

While TLC5971 makes a great LED driver its low current sinking ability is very limiting. Is there a multichannel MOSFET array where PWM pulse on gates can be used to drive RGB LEDs with minimum 8 bit steps and ability to handle 1 Amp current per channel.

Does such a integrated "Mosfet Control Array", conceptually equivalent to a current sinking ULN2803 exist ? If not any suggestion for high current handling LED driver are welcome.

  • 0
    TI__Expert 5475 points
    Hi Rav,


    Sorry for the late response. The appropriate application engineer has been notified of your post and will respond accordingly. Thanks for your patience.

    Best regards,
    Shirley He
  • 0
    TI__Genius 14295 points
    Hi, Rav,

    I'm not sure if there is such MOSFET array, but we may give you more suitable solution if you can give us more details on your application "drive RGB LEDs with minimum 8 bit steps and ability to handle 1 Amp current per channel" like:
    1. How many channels do you need?
    2. Is it necessary to have constant current output?
    3. What is the end equipment?

    Thanks.

    Regards,
    Kenneth
  • 0 in reply to Kenneth Du
    Prodigy 80 points
    Hi Ken:

    Here is the response to your queries.

    1) Need 3 channels but don't mind more if chip comes with it.
    2) Using string plus the quality need, I would say constant current.
    3) It is for an artistic display where light quality and color range(steps) are key.

    Hope that helps. Open to suggestion so I can get a simple and a scalable solution.

    Best,
    Rav
  • 0 in reply to Rav Kal
    TI__Genius 14295 points
    Hi, Rav,

    I suggest TPS54200, and you can check if this can meet your requirement.

    BTW, can you share some infomation about the RGB LED you want to drive?

    I'm curious why it need 1A current.

    Thanks.

    Regards,
    Kenneth
  • 0 in reply to Kenneth Du
    Prodigy 80 points
    Hi Ken:

    I think that should work. Just will have to use three of them.

    Yes, 1A is high and I had earlier inquired about it. It is a custom LED which the client architect has used for years with good results.

    Any views on H-Bridge LED Driver ? Seems compact but tad expensive.

    Thank you,
    Ravi
  • 0 in reply to Rav Kal
    TI__Genius 14295 points
    Hi, Ravi,

    For H-Bridge to drive LED, I don't see a lot such applications.

    Do you see such requirement or any idea why using H-Bridge since led doesn't need to achieve DC to AC?

    Thanks.

    Regards,
    Kenneth