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LP5861T: LP5861T max. current in parallel operation?

Alexander Klein
Prodigy 10 points
Part Number: LP5861T
Other Parts Discussed in Thread: , LP5860EVM, MSPM0L1306

Tool/software:

Hi TI-Team,

I'm using an LED driver called "LP5861T" for an ongoing project (ambient lighting).

I've had good experiences with the "LP5861TEVM Evaluation Module," which I can use in this project.

However, I need help with three points that I couldn't find in the datasheet or application notes.

Question:

1.) Is it possible to connect two or more channels in parallel to an LED and control them via software, with the goal of generating a higher current (e.g., 250 mA from 2 x 125 mA/channel) for the LED?

2.) Why is the current limit in the LP5861x GUI control set to 50 mA and not 125 mA per channel?

3.) Is there a way to read, adapt, and test the code in the LP586x GUI control? This would help me understand the functionality and parameterization of the LED driver's channels and adapt it to my current project.

I would appreciate any help.

Best regards, Alex Klein

  • 0
    TI__Expert 5600 points

    Hi Alexander,

    1. Yes, multiple channels can be paralleled to support higher current
    2. As the GUI is developed based on the non-T version at the beginning, and the T version is released after that. But when you set the max current as 50mA in the GUI, the connected LP5861T should output 125mA.
    3. No, write code on the GUI is not supported. But register write/read is available on the "Register Map" page. However, we have the sample code developed based on MSPM0L1306 LaunchPad to control the LP5860EVM board. If you have interest, please send me an email, felix-wang@ti.com , then i will send the document and code to you.

    Best regards,

    Felix

  • 0 in reply to Felix Wang
    Prodigy 10 points

    Hi Felix,

    thank you very much for your quieck reply/ details. I sent you an email request regarding for documentation & example code.

    Did oyu receive my mail?

    Best regards

    Alexander

  • 0 in reply to Alexander Klein
    TI__Expert 5600 points

    Hi Alexander,

    Yes, I received your email. And had replied to you by then.

    I have sent the email to you again. Please help to check your inbox and let me know if it is still not found.

    Best regards,

    Felix

  • 0 in reply to Felix Wang
    TI__Expert 5600 points

    Hi Alexander,

    I have received your email and sent an email to you again about ten minutes ago. Have you received it?

    Best regards,

    Felix

  • 0 in reply to Felix Wang
    TI__Expert 5600 points

    Hi Alexander,

    In case you have note received the forward email to your personal email. The sample codes based on LP5860EVM can be found in the link below.

    Please let me know if you can download the files.

    Download Link: https://tidrive.ext.ti.com/a/bFzus1Pc7qp-XO6i/9d02641c-7507-4e6c-b647-a5bc8b5136f0?l 

    password: b`yrkW14

    Best regards,

    Felix

  • 0 in reply to Felix Wang
    Prodigy 10 points

    Hi Felix,
    theanks for your message/ mail. So I test & try to log in. but I haven't luck.

    So I try with my TI account (mail adress) but the sstem don't accept the Log-In date. It's maybe a question, I need a additional account (TI Enterprise or ENT.TI.com)? 

    I have received your information about the attachments, which zip file must be selected, and Powerpoint.

    Can you help me.
    Best regards 
    Alexander
  • 0 in reply to Alexander Klein
    TI__Expert 5600 points

    Hi Alexander,

    I'm also not sure why....

    I attached the zip file here directly. Please let me know when you complete the download.

    LP5860EVM Sample Code C-Language.zip

    Best regards,

    Felix

  • 0 in reply to Felix Wang
    Prodigy 10 points 
    Hello Felix,
Thank you very much for the zip file. It worked perfectly without any problems. I've now fully understood how it works using the sample code and found my error.

It works great.

I'll continue testing the LED driver and will get back to you if I have any questions.

Thank you again for your great help.  :-)

    Best regards
  • 0 in reply to Alexander Klein
    TI__Expert 5600 points

    Hi Alexander,

    Sure, you are welcome~

    Best regards,

    Felix