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LP5012: How to connect 24V RGB leds strip to LP5012

Bernard FROMENT
Prodigy 30 points
Part Number: LP5012
Other Parts Discussed in Thread: TLC59116

Tool/software:

Hi the community,

We have a stock of LP5012 (from another project).

I'd like to drive a RGB leds strip with this chip for a new project.

The problem is that the RGB leds strip is 24V (common anode) and the LP5012 is 5.5V maximum !

Somebody has an idea of how to connect the LP5012 to leds strip ?

Surely not directly because maxi voltage on OUTx outputs is 5.5V.

  • 0
    TI__Genius 17795 points

    Hi,

    The maximum output voltage of LP5012 is 5.5V, so it can't support LED strip over than this voltage. For your requirements, I'd like to recommend TLC59116 to you. Please let me know if you have any questions.

    BR, Jared

  • 0 in reply to Jared Zhou
    Prodigy 30 points

    Hi,

    The TLC59116 is only 17V tolerant on its output. Not 24V !

  • 0 in reply to Bernard FROMENT
    TI__Genius 17795 points

    Hi Bemard,

    I am sorry I miss it. Can you please show me your application block diagram since normally the RGB LED driver can't support so much high output voltage and with the I2C interface at the same time?

    How about the serial interface LED driver or matrix topology LED driver? But first, I need to check about your LED numbers and output current. Thanks!

    BR, Jared

  • 0 in reply to Jared Zhou
    Prodigy 30 points

    Hi Jared,

    Application is classic: We want to drive a standard RGB led strip 24V (4 wires, common anode)

    The maxi current per color is 50mA

    Structure of RGB led strip : serial / parallel with serial resistors.

    On our system we get 3V3, 5V and 24V power supplies

    It exist many TI products driving leds but all get a buck/boost power supply integrated. None with OUTx acceptiing 24V.

    Cant we add external FETs to LP5012 or an interface chip ?

  • 0 in reply to Bernard FROMENT
    TI__Genius 17795 points

    Hi Bemard,

    Thanks for your feedback, please help to confirm my below questions:

    1. Do you mean you only need 4 channels to support 4 LED strip?

    2. How many LED number in every LED strips?

    3. If your maximum output current is 50mA, I think LP5012 can't match your requirement either if you can accept to connect some channel in parallel.

    BR, Jared

  • 0 in reply to Jared Zhou
    Prodigy 30 points

    1-Yes like in all RGB led strip: 3 channels + common anode

    2- I dont know how many leds : it the schematics of the led strip manufacturer. We have only access to the 4 wires

    3- The problem is not the current, it is the voltage : 24VDC

    It seems you dont know what is a led strip:

    link

  • +1 in reply to Bernard FROMENT
    TI__Genius 17795 points

    Hi Bemard,

    Actually, I know what is a LED strip, I just want to make sure how many LEDs in that for a single channel, then I can make sure the output voltage you need.

    I am curious that if you don't know how many LEDs in that, why do you know you must need 24V DC for the output voltage?

    If possible, please help to provide the datasheet for the LED strip for provide a block diagram for that. I will help to check if we have suitable device for you.

    BR, Jared