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BQ500212AEVM-550

gianluca peterle
Intellectual 475 points
Other Parts Discussed in Thread: BQ500212A

IMAGE FROM TP1 test point of TX EVM.

Good mornig, I changed the standard coil of EVM-550 to TDK WR301025-19M8-G (12.8uH) instead of 6.3uH and removed capacitors C27 and c28 to have right resonance frequecy.

What could be wrong here for such strange waveform?

  • 0
    TI__Guru* 75656 points
    For the bq500212A TX coil we recommend several coils, see bqTESLA Transmitter Coil Vendors.
    www.ti.com/.../slua649f.pdf

    Also a couple of smaller Coils from Wurth have been used:
    ** 760308101103 is a 30mm coil -- DCR 0.15 ohms
    **760308101104 is a 20mm coil -- DCR 0.11 ohms
    Smaller coils from other vendor are available including TDK.

    A key requirement for the TX coil will be low DC Resistance due to high circulating current in the Coil and Capacitor circuit. Lower the better and 20mm and 30mm coil are on the high side but will work for low power.
    The TDK WR301025-19M8-G is design for the Receiver (RX) side and has a DCR 1.27 ohms. It will work for RX but not for the TX side.