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2A 80W boost led driver on a single layer board

niels woelders
Prodigy 45 points
Other Parts Discussed in Thread: TPS40211, TPS92690, TPS92411

i need to make a 2A boost driver for about 80W. the issue is that it need to be on a single layer metal core board. 

what IC will be best for me to use for this? 

hope to get tome tips on this!

thanks!

  • 0
    TI__Mastermind 25500 points
    I saw this post in the other thread as well. The TPS40211 is pinned out well for a single layer board, but whether or not it could do 2A at 40V output would depend on the input voltage and switching frequency just like any controller. The bigger issue is the metal core PCB. Putting a switching regulator on a MCPCB is very difficult due to the noise generated, the capacitance of the metal core board, and lack of ground return paths. If you can use a second layer for a ground plane you would have much more luck. Otherwise you may need to control the slew rate of the switch and possibly other EMI mitigation techniques to get it to work properly.
  • 0 in reply to Clinton Jensen
    Prodigy 45 points

    thanks Clinton!

    i know the routing is not the issue (made a proto) but it's not working well

    the thing is that i need to make a design for 240W and 480W 

    i wanted to do this with 3 x 80W and 6 x 80W drivers on the same board. input is 24V because of this boost is most ideal.

    do you have some suggestions on a maybe better chip to use for this?

    as i don't have to much time for get it ready as we need to produce quite some of them soon.

    thanks!

  • 0 in reply to niels woelders
    TI__Mastermind 25500 points
    The TPS92690 has a lot more drive current for the external FET so you would have better luck getting up to 80W. But if you run at a low enough switching frequency and use a good FET the TPS92411 could likely do it as well. But single layer boards can be difficult with switchers as I mentioned, particularly on a MCPCB. 3 or 6 on the same board will be much more difficult. Is there a reason the drivers need to be on a MCPCB? I've been working with switchers for a long time and I would not be confident that I could get multiple switchers working together on the same metal core, single layer board.
  • 0 in reply to Clinton Jensen
    Prodigy 45 points

    on the moment we use 14 drivers on the same MCPCB but they drive the leds on 1A we have to adjust this to 2A. but current driver can not do more then 1A.

    thats why i have to change it. with current design i have very good EMC filtering per driver so there is close to no EMC around 10dB.

    the moulds for the products are all done, thats why they have to be on that board to fit the housing

    thanks for the tip for the different driver chip! 

    is there also a e-mail were i can contact u then i can send pcb layout to see what you think about it

    thanks!

  • 0 in reply to niels woelders
    TI__Mastermind 25500 points

    If you want to do a friend request I can send you a private message with an e-mail address. I'd be happy to take a look at the layout.