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TPS54561-Q1: Webench | EMI filter

Jaya surya
Prodigy 50 points
Part Number: TPS54561-Q1
Other Parts Discussed in Thread: TPS54361-Q1, TPS54561, TPS54361

Hi,

We would like to use TPS54561-Q1 in our new design. I'm not able get a solution using TPS54561-Q1 when I try to create one using Webench with input EMI filter added. But it's generating design using TPS54561-Q1 if I'm not adding input EMI filter.


Input:DC 8 V - 60 V

Output:5 V at 3.5 A

Frequency : 800 kHz

Is that good enough to use the design based on TPS54361-Q1 with EMI filter and use TPS54561-Q1 instead of TPS54361-Q1

  • 0
    TI__Guru 50120 points

    Hi,

    You can exact that at higher output currents (3.5A+) the EMI filter you have in your old design may/may not be enough to dampen the noise and as such may require a more in-depth design consideration.

    However, so long as the power conditions between the TPS54561-Q1 (new design) and your old TPS54361-Q1 (old design) is the same the filter should work for the new design.

    Regards,

    Jimmy 

  • 0 in reply to Jimmy Hua
    Prodigy 50 points

    Thank you Jimmy for the prompt response.

    I've selected TPS54561-Q1 based design in webench. However not able to generate a design with input EMI filter.  Is there any design issue as such or an issue with webench ?

  • 0 in reply to Jaya surya
    TI__Guru 50120 points

    Hi,

    Did you have the option to enable input EMI filter on Webench? If not I will need to look into this since it might be the case that the model was created without input filter option enabled.

    Again as recommended previously please use the same filter you had for the old design. The filter should not have changed between old to new design if you are still operating at the same power conditions.

    Regards,

    Jimmy 

  • 0 in reply to Jimmy Hua
    Prodigy 50 points

    Hi Jimmy,

    Thank you.

    There is no option to enable input EMI filter on Webench for TPS54561.

    At present as you suggested we're following the design with EMI filter for TPS54361, and the DC-DC will be TPS54561.

  • 0 in reply to Jaya surya
    TI__Guru 50120 points

    Hi Jaya,

    Yes so long as the power conditions(ie. load current) doesn't change from old design to new design, the EMI filter will work for both cases. 

    Regards,

    Jimmy

  • 0 in reply to Jimmy Hua
    Prodigy 50 points

    Hi Jimmy,

    Thank you for the prompt support. I would like to get your suggestion in the placement of EMI filter as well.

    Our design is for an automotive GPS tracker and so the input protections (Load dump, Over voltage, Reverse polarity, Transients etc.) are there before TPS54561. Do we need to plan the EMI filter just before the input of TPS54561(ie after protections) or at the main power entry from the vehicle battery(ie before protections)?

  • 0 in reply to Jaya surya
    TI__Guru 50120 points

    Hi Jaya,

    I would put it right before the TPS54561 and after the protection circuit. The closer the input filter is to the input source the better the attenuation due to reduced trace inductance. This also logically makes sense since the protection circuit should protect the full system circuit which includes the EMI filter too.

    Regards,

    Jimmy