• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 63 subscribers
  • Views 438 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

High current synchronous LED driver

Rohan Dayal
Prodigy 130 points
Other Parts Discussed in Thread: LM3150

Hi all,

I am looking for an IC capable of running a synchronous buck converter for driving LEDs.

The approx specs are

Vi = 25V, Vout is 5-10V for load current < 4A.

I was thinking of using LM3150 and use output current feedback instead of voltage for regulation. Does this look like a good idea (I am more worried since this IC seems to be working in hysteric mode).

Any other IC that is suitable for this application would also be appreciated. The need for synchronous conversion comes from the requirement for having high efficiency even at low voltages.

Regards,

Rohan

  • 0
    TI__Genius 10115 points

    HI Rohan,

     

    Although the LM3150 can be made to work as a synchronous buck converter for driving LEDs. It will require some extra circuitry to add a DCR sense to the circuit that adds complexity.

     

    I ran a quick calculation on Webench, one of our online component selection and simulator tools.  Which you can find on the TI home page  WWW.TI.COM

    It came up with the LM3434 as your best solution.  Here is what I entered as your paramters.

     

    Then I added the following LEDS

    This is the solution that it provided

    Regards,

    Marc