• State TI Thinks Resolved
  • Replies 9 replies
  • Answers 4 answers
  • Subscribers 64 subscribers
  • Views 222 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

LM3410: 5V to 30V Boost LED Driver

Steve Jarvis
Intellectual 600 points
Part Number: LM3410
Other Parts Discussed in Thread: TPS61169, TPS61165

Tool/software:

Hi,
I need to power either one of two different types of displays from a single PCB. Which one is connected will be selected in production depending on the product model. So only 1 display is connected at any given time.

The two displays have the following backlight characteristics:

- Display 1 with Backlight needing 18V @ 100mA
- Display 2 with Backlight needing 30V @ 50mA

On the PCB two voltages are available: both 5V and 24V.  So I can use either to power the backlight driver.

I saw the LM3410 but the limit is only 24V out.

The space on the PCB is limited (working on 0402 level components). Do you have any very compact (SOT-23 ideally) LED driver that can power those displays from either 5V (that would require a boost converter) or the 24V (that would require a buck-boost which might take more space on the PCB which is not ideal).

On the boost converter possible solution, is it even possible to boost 5V to 30V? Or is it too much especially at 50mA?

Thank you

  • 0
    TI__Intellectual 1130 points

    Hi Steve, 

    Glad to help you with the questions! Could you please share the end equipment of these two display and the run rate? 

    LM3410 is an old device. We have a lot new devices for your application. 

    For existing devices, I would recommend TPS61169 and TPS61165. 

    We also have a brand new device,TPS92361X, not officially released to market yet, with 1.6mmx1.6mm SOT563 package, which will be the 1st synchronous boost LED driver in this market. 

    Could you please leave your email address here? I can send you the materials via email if you are interested. 

    Thank you! 

    Best, 

    John. 

  • 0 in reply to John Shen
    Intellectual 600 points

    Thank you John,

    The look interesting parts! The application is smart vending machines.

    A few more questions:

    1) By plugging in two different display, one with the backlight that uses 10 LEDs in series and the other 4 LEDs in series, do those ICs take care of it automatically? i.e. do they adjust the output voltage just by monitoring the current?

    2) if I put a pullup between CTRL and 5V, would that ensure that at boot (before the micro has time to start generating the PWM for the brightness) the current is at its maximum for my application (80mA)?

    3) The TPS61165 is available both in SON and SOT-23. If the input voltage 5V, the output current is up to 100mA, and the output voltage 30V (10 LEDs) is the SOT-23 enough for power dissipation?

    4) To avoid missing some information (and not out of laziness of not wanting to read the full datasheetsSlight smile) is there a comparison table that shows the differences between the TPS61169 and TPS61165?

    Yes, happy to share my email address but not publicly in the forum. I sent a friend request, if you accept it happy to send you my email address.

    If you'd rather not do that, could you please share all those files/material you offered here?

    Many thanks for your help! Slight smile

  • 0 in reply to Steve Jarvis
    TI__Intellectual 1130 points

    Hi Steve, 

    I have added you as friend. Please send me the email so I could better support via that. 

    Let me try to answer you questions. 

    1). Yes. The driver controls the output current. The output voltage will be automatically got. 

    2). Pull up CTRL will get full-scale current, which is set by VFB/RSET. 

    3). For TPS61165, I will recommend SON because of better thermal. But the ILIM(current limit) might be a problem. I will recommend a larger inductor like 10uH. 

    4). I could provide that later to you via email. 

    If your schedule is not tight, I highly recommend TPS92361X, which do not have either thermal or ILIM problem. 

    Thank you! 

    Best, 

    John. 

  • 0 in reply to John Shen
    Intellectual 600 points

    Thank you John,

    the schedule is quite tight, so we cannot wait for the TPS92361X. But if it is fully compatible with the TPS61165 (and perhaps needs some extra components to work) we can design the extra components in now and change to that part in the future.

    I cannot see any friend request or notification about the friendship. When I create a new message next to each John Shen is says "cannot message".

    As I said, happy to share my email with you, but not publicly on a forum. Already enough spam. Can you please check the friendship request or let me know how else we can connect.

    Thank you

    P.S.

    No idea who designed or configured the software for this forum, but it is insane to use on so many levels... cannot send friend requests, cannot attach/upload files (unless it is from a URL which is beyond bizarre), cannot paste content like images... No other forum, regardless of their size, has any of those limitations. It is insane. Surely I am not the only one to complain...

  • 0 in reply to Steve Jarvis
    TI__Intellectual 1130 points

    Hi Steve, 

    Glad to know TPS61165 is good for your design. 

    My email is john-shen@ti.com. Welcome to send emails to me for better support you. 

    Thanks! 

    Best, 

    John. 

  • 0 in reply to John Shen
    Intellectual 600 points

    Thank you I sent you an email.

  • 0 in reply to Steve Jarvis
    TI__Intellectual 1130 points

    Hi Steve, 

    Since we transfer the conversation to email. I am closing this thread. 

    I will send you the comparison table late today. 

    Thanks! 

    Best, 

    John. 

  • 0 in reply to John Shen
    Intellectual 600 points

    Ok,

    thank you.

  • 0 in reply to Steve Jarvis
    TI__Intellectual 1130 points

    You are welcome.