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TPS7B7702-Q1: Need the explain for the 1mH in the TPS7B7702EVM.

Kuno Wu
Prodigy 80 points
Part Number: TPS7B7702-Q1
Other Parts Discussed in Thread: TPS7B7702EVM,

Hi Team,

We are using the TPS7B7702EVM to power  the Car Antenna, but we find the EVM have a 1mH inductor between the LDO output and Antenna, is it mandatory?(for the real application?) I don't find any explain, thank you.

Best Regards,

Kuno

  • 0
    TI__Guru 50025 points

    Hi Kuno,

    The inductor is there to provide a pad to place an inductor to form an LC filter if one is required for a given application, but is not required for the normal operation of the TPS7B7702-Q1. If you do not need it, you can bypass the inductor by using the REG_OUTX test points. 

    Regards,

    Nick

  • 0 in reply to Nick Butts
    Prodigy 80 points

    Hi Nick,

    Thank you for your quick response.

    Is it possible that it is equivalent to the inductance of this cable?(just like below picture shows.) Thank you.

    Best Regards,

    Kuno

  • 0 in reply to Kuno Wu
    Prodigy 80 points

    Hi Nick,

    I also find the series inductor description in the datasheet, it means this 1mH inductor?

    Best Regards,

    Kuno

  • +1 in reply to Kuno Wu
    TI__Guru 50025 points

    Hi Kuno,

    No, the description in the datasheet is referring to parasitic inductance that is common in applications where this device is used because this device is often used in applications to power antennas that are off-board and connected by long wires. With that said, the 1mH inductor pad can be used to emulate the line inductance as well.

    Regards,

    Nick