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BQ51010B: Communication Robustness

Needhu Gunasegaran
Intellectual 2880 points
Part Number: BQ51010B
Other Parts Discussed in Thread: BQ51050B

Hi,

Could you please answer my customer question.

In the datasheet of the bq51050b it is written that communication robustness increase if you change the COMM capacitors from 22nF to 47nF. I had to do this to increase make the power transfer work. My question now is, will the robustness increase even more if you increase the capacitor a little bit more to maybe 68nF? I am asking because the increase from 47nF helped me to start the charging bit it is still not enough (the gap between the coils must be around 2mm to start the charging and I like to increase the gab more). On my receiver side I have a coil with a hole and that is why I have some trouble to start the communication between the coils. (I don’t need to follow the WPC specification, I just have to make it work :D)

Thanks,
Needhu

  • 0
    TI__Guru 69966 points
    Hello
    The COMM cap can be increased to 68nF.
    If the RX coil value is high the Cs (C1) tuning value will be low and this will limit the comm cap value.

    2mm gap required to start charging could indicate that the voltage on RECT pin is not reaching UVLO with the initial ping at 175kHz.