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What is TI's most efficient solution for driving a 56v 3.96A LED array?

Cirthix
Prodigy 195 points
Other Parts Discussed in Thread: TPS92691, TPS2836, LM5111

Webbench was not giving very helpful results.  Input power supply can be either 10-12v OR 20-24v.

Most solutions that I've seen use a series diode in the boost topology, so that's a hefty loss at 4A.  Does TI have any synchronous boost led drivers?

The targeted COB:

If nothing, we will also consider the slightly smaller CHM27:

Thanks :)

  • 0
    TI__Mastermind 25500 points
    I am not aware of any synchronous boost LED drivers. But the TPS92691 would be capable of it. You would have the best success with the higher input voltage (almost 20A of switch current at 12V input is huge) and you would likely need to switch at a relatively low frequency to minimize losses, but it could drive the 52V load at 4A. It would be a much easier design to use the 35V LED however.
  • 0 in reply to Clinton Jensen
    Prodigy 195 points
    Are you suggesting something like a TPS2836+TPS92691 solution? That seems reasonable to me, though I was hoping that it would be something that could be simulated on webbench.

    I would like to try this solution in simulation, do you have models available for these components?

    Thanks
  • 0 in reply to Cirthix
    TI__Mastermind 25500 points

    I'm not familiar with that other device or how you would intend to use it. If there are models for either they should be in the product folder of the device under the tools tab. In any case I meant just to use it as a standard boost regulator. You could add additional gate drive to make it easier to drive a big FET by using an LM5111 type of device if you wanted to. Either way the standard boost with a diode could still achieve around 90% efficiency or a little better.