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BQ51050B: Capacitor Cd, Cs effect on efficiency

Derek
Mastermind 9701 points
Part Number: BQ51050B

Hello, I'm working on a very small implementation of the BQ51050B family. This family of parts has three capacitors each for the Cd and Cs part of the LC tank. Size is a priority. I saw that the TIDA-00329 design omitted these but how much does this affect charge efficiency? If I only use one capacitor for each of those and get it within 10% of the required value, then does that mean that it will be 10% less efficient? I read the tuning guidelines in the datasheet and the Qi standard; I just don't know how sensitive the design is to frequency mismatch.

Also, what is the recommended voltage rating for the Cd, Cs capacitors?

Thanks,

Derek

  • 0
    TI__Guru 65846 points
    Hello
    A lot depends on the plans for TX. If you are using an off the shelf Qi TX then it would need the capacitors. If you are building your own TX and will not claim Qi compatibility then can possibly get by without the Cs capacitors.
    It is best to have the Cs caps, communication works better.

    Voltage rating should be 50V.

    We can talk about this one off line also.