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BQ51003: Wireless charging circuit - Circuit design questions

Jorge Herrera Santos1
Intellectual 320 points
Part Number: BQ51003
Other Parts Discussed in Thread: TIDA-00318, TIDA-00669

Hi,

I'm designing a circuit using wireless charger BQ51003 and I would like to be sure that I designed it correctly. Here is the circuit:

When battery is charging, microcontroller will sleep.

Do you recommend me to add something?

Thank you very much,

Jorge 

  • 0
    TI__Guru 65866 points

    Hi Jorge

    See below check list for schematic review.   TS_CNRL (F1) needs to be 10k resistor.

    Also for layout use TIDA-00318 and TIDA-00669.

    Things to check on your design:

    1. Pin out of symbol, make sure it matches device

    2. AD pin ground – if adapter option not used

    3. COMM, BOOT, CLAMP and AC – Recommend reusing values from EVM / Application section 

    4. PGND connection -- verify good connection to ground

    5. ILIM pin connection to ground thru FOD resistor -- verify current limit set point

    6. FOD pin connection, 196 ohms good value to start, tune during fod cal

    7. EN1 / EN2 Pin ground -- recommend adding 0 ohm to give you options

    8. CHG pin LED, Open drain output 

    9. TS / CTRL Pin connect to gnd with 10k, safe condition good

    10. RECT pin (AC1/AC2 full wave rectified signal), Cap bank to filter signal --- max voltage could be 15V to 20V.  Note R20 value set during fod cal, 20k OK to start.

    11. OUT pin needs 1uF (effective capacitance) near the pin.  C7 - 2.2uF looks OK.

  • 0 in reply to Bill Johns
    Intellectual 320 points

    Hello Bill,

    Thank you for the answer. Attached below how it looks like:

    Thank you for the support!

    Jorge

  • 0 in reply to Jorge Herrera Santos1
    TI__Guru 65866 points

    Hi Jorge

    The BQ5103 circuit looks OK.