• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Subscribers 62 subscribers
  • Views 701 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LM36011: VCSEL application

chentsu chung
Mastermind 6180 points
Part Number: LM36011
Other Parts Discussed in Thread: LM36010, LM3644

Hi Sir,

Now I have a project wnat to use VCSEL LED(see the spec below), input 5V, and control it on for 3ms, off-60ms, on-3ms, off-60ms......

1. can I use two LM36011 to drive the LED?

2. If I input 5V, and the Vf=2V, where is the other 3V?

3. How to control flash LED on-off-on-off...? Use STROBE in IR Mode? Is ther any timing limitation? (I want to control it as 3ms, off-60ms, on-3ms, off-60ms......)

4. Or is there any other better solution?

PS. The drivering current could up to 3A, it's kind of Laser LED. Based on driver solution, maybe the current spec could modify, but 1.5A at least.

  • 0
    TI__Mastermind 22745 points

    Hi,

       Baes on your question, Here is the answer:

       (1).Yes you can use two LM36011 to drive the LED;

       (2). If the Vin>VIN − ILED x RPMOS, the drop voltage will consumer on the internal current sink;

       (3). You can use the IR mode to control the LED, it's very fast, can support 3ms on, 60ms off;

       (4). LM36011 only works on pass mode,  we have another solution LM36010 can support both boost and pass mode; and we also have LM3644 can support 2 channel LED to total 2.5A;

      (5). Lm36011 can support max 1.5A, it should meet your demand, and pay attention to the heat.

    Thanks.

    Best Regards

    Sean

  • 0 in reply to Sean Zhou
    Mastermind 6180 points

    Hi Sean,

    Thanks for your great support. SO...

    1. If I need only 1 LED (pass mode) --> LM36011 x 2

    2. If I need 2 LEDs (boost mode) ---> LM36010 x 2 or LM3644

    Am I right?

    But in the flash mode, the only limitation are the current limit and flasf time-out, am I right?

    so I have to monitor the thermal permance.

    Thank you.

  • 0 in reply to chentsu chung
    TI__Mastermind 22745 points
    Yes, but LM3644 can only output maximum 2.5A.
    1. I f you need only 1 LED(pass mode), you can choose LM36011/Lm36010;
    2.If you need boost mode, you should choose LM36010 or Lm3644.
    The limitation is the current limit and time out. you are right.
    Best Regards
    Sean
  • 0 in reply to Sean Zhou
    Mastermind 6180 points
    Hi Sean,

    Got it, thank you very much!