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TPS55340-Q1: schematic review

Dongbao Zhou
Expert 3960 points
Part Number: TPS55340-Q1

Hi team,

Could you help review the attached schematic of tps55340-Q1?

Design specs: Input: 12V battery, normal range 7-18V, output: 15V/0.5A

Thanks.

Dongbao电源.pdf

  • 0
    TI__Mastermind 40080 points

    Hi Dongbao,

    What is Vin range, if Vin is < Vo, then you actually can use boost topology instead of the Sepic topology.

    The parameter is OK. for the main inductor, you choose a 2-3A rating inductor , which is enough for this application if the minimum Vin is around 12V.

    Why do you add inductor L16, this inductor is not good , it will introduce input voltage ringing problem.  You can use a 2A rating bead instead.

  • 0 in reply to Helen chen
    TI__Expert 3960 points

    Hi Helen,

    Thanks for your reply.

    The input range is 7-18V, normal voltage is 12V. The output voltage is 15V, so we have to use sepic.

    L16 combines with the capacitors form a pi filter, the customer uses it for EMI improvement. Can we pass EMI test without L16 for the sepic circuit?

    Dongbao

  • 0 in reply to Dongbao Zhou
    TI__Mastermind 40080 points

    Hi Dongbao,

    EMI is mainly related to the layout, then the filter. The bead has wider frequency range than the inductor. So I suggest you use a 2-3A rating bead at the input side.