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Need to choose right LED driver for our application

Other Parts Discussed in Thread: TPS54201, TPS92512, LM3409

Hi,

We need LED driver for 1 meter led lighting strip (12V,120 Leds(3 in series X 40 Parallel), 3028 Size) which is readily available but we don't have the document for the same.

We have tried to drive directly from the 12V,30A power supply. its lighting well but if all the peripherals connected the lighting brightness will go down. So we need better constant current driver.

So kindly advice which IC is suitable for our requirement.

Regards,

Naveen K

  • Hi Naveen,
    Could you check TPS54201?
    I think this can slice you problem.
    Any problem please let me know.
    Thanks!
    Summer
  • Hi Summer,

    Thanks for the reply.
    For driving the 120 leds required at-least 2.4A (120 X 20mA) right? If yes kindly advice the suitable one.

    We will use 24V supply voltage. How can we regulate to 12V?. Because i couldn't found divider network / adjustable pin in this ic.

    Regards,
    Naveen K
  • Hello Naveen,

    So the LED stack voltage is 12V total, what is the maximum current do you need to drive through it? Also, what input do you have available, just a 12V rail or is something else available? Do you have any dimming requirements and if so analog or PWM or both? Let me know and I will see if we have anything that will work for you.

    Thanks,

    Clint

  • Hello Naveen,

    That is a good amount of current. The two best options I can think of then would be:

    1. TPS92512. This device is an integrated buck and can do the current. You might be pushing it a bit thermally though. But it would work if you have really good heatsinking and use a low switching frequency.

    2. LM3409. This is probably the better choice as it is a controller and can easily do 2.4A.

    Both devices are capable of both analog and PWM dimming if you need either feature.

    Regards,

    Clint

  • Hi Clint,

    Thanks for the information.

    I will use TPS92512 . I gone through datasheet but couln't find, Vout / PH is a adjustable voltage or not? If yes how can we adjust the output voltage for the LED. We are using 24V, 30A Supply, need 12V output for LED strip.

    Regards,
    Naveen K
  • Hello Naveen,

    The TPS92512 is a current regulator which is what you want for driving LEDs. You set the current with a resistor from ISENSE to ground and the output voltage will just be the ISENSE voltage plus the LED stack voltage (12V in your case). This is desirable for LED drive because LED forward voltage can vary from string to string and it will for sure vary as the LED heats up. If you use a voltage supply the current will be very different between different LED loads.

    Regards,

    Clint

  • Hi Naveen,

    TPS54201 is constant LED driver, the max input voltage is 28V, when input is 24V, the output will be regulated at the LED forward voltage, for 3 LED in serial, the forward voltage will around 10V. You just need 2 pcs TPS54201 which can support current up to 3 A.

    TPS54201 is synonymous buck solution, it will offer very high efficiency and protection for your solution.

    Any question please let me know.

    Thanks!

    Summer

  • Hi Clint,



    Thanks for the information.



    Appreciate your support.



    Regards,

    Naveen K
  • Hi Summer,

    Thanks for the information.

    Appreciate your support.


    Regards,
    Naveen K
  • Hello Naveen,

    I am going to close this thread. But you will still be able to post to it if you have further questions.

    Regards,

    Clint

  • Hi Clint,

    Thanks for the support.

    I got the solution,i have ordered the IC. You can close this thread.

    Regards,

    Naveen K