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Boost converter with low EMI raidation

shiwei luan63
Prodigy 140 points
Other Parts Discussed in Thread: LMZ14201, TPS61088, TPS43060, LM3481

Hi, I am looking to find a BOOST IC with low EMI.

I found a BUCK IC LMZ14201 that is specified with low EMI, but didn't find any boost IC designed with low EMI.

I read the AN http://www.ti.com/lit/an/slva790/slva790.pdf

Please make some candidates.

Thank you.

  • 0
    TI__Guru 71526 points

    Hello Shiwei,

    LMZ14201 is a MODULE, and you asked for a boost IC.  Are you looking for a boost MODULE, or will you create your own design around an IC?  If a MODULE, please review the http://www.ti.com/product/tps81256 .

    Regards,

    ~Leonard

  • 0 in reply to LeonardEllis
    Prodigy 140 points

    Hi Leonard,

    Thank you for your response. Both MODULE and discrete IC are OK, as long as they have low EMI feature. I want to boost from 24V to 33V. Appreciate it very much if you have candidates.

    Thank you.

  • 0 in reply to shiwei luan63
    TI__Mastermind 40080 points

    Hi Shiwei,

    What is the output current in your application? do you care about the operation frequency?  What kind of EMI standard need to pass? CISPR22 class B?

  • 0 in reply to Helen chen
    Prodigy 140 points

    The boost converter is able to supply 3A/32V, operating frequency doesn't matter. I will design a industrial device with a board that is designed with a boost converter. The whole device requires a CE mark, no the board itself. So I am looking for a boost module or IC that has very good EMI feature.

    The TPS61088 is an candidate, the EMI test results are very close to  the threshold. Since the I will do EMI test on a device level, I am not quite sure if this IC is good enough. If there are any boost module with very good EMI feature similar to LMZ14201, that will help a lot.

    Thank you.

  • 0 in reply to shiwei luan63
    TI__Mastermind 40080 points

    The maximum output voltage of TPS61088 is only 12v, so it can't fit. The EMI test result of TPS61088 is without the input/output  filters and on a bare board. In real application , there usually has filters on board. So the result will be even better

    As your output voltage and total output power is high, so I suggest you to use a boost controller instead of the integrated IC. LM3481/78, TPS43060 is fit for your application.  By choose a right frequency, a right filter, and by adjust the drive resistor, it can pass the EMI test easily. For the guys who is familar with is board design, it should be easy.