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Test Report Questions bq51050B

Michael Bajema27
Prodigy 100 points
Other Parts Discussed in Thread: BQ51051B, BQ51050B

I am looking at the documentation for the TIDA-00329 Test report. I noticed that this design does not include capacitors on AC1 and AC2. What ones were used for the two coils in this test report? Also I have a question about doing the FOD on this. The documentation states the use of a battery emulator. Which one was used?

  • 0
    TI__Genius 14890 points

    Michael,

    The AC1 series capacitors (generally called Cs) and the AC1-AC2 parallel resistors (Cd) are required for setting the resonant frequency in a Qi system.  In this case, the Qi-compliance or Qi-certification are not required so the Cs and Cd capacitors are not used.  This means the resonant frequency of the RX is only "self-resonance".  The system as designed works well with the transmitter EVMs used in the evaluation (and the few commercially available transmitters that were used).  Your system may or may not need the Cs and Cd capacitors depending on the transmitter that will be used.  

    Testing of this device was using a Keithley Source Meter Model 2420.

    For the bq51050B / bq51051B, the 2420 was set to a specific voltage level and the current limit was set above the charge current.  The bq5105xB will regulate the current based on its ILIM setting.  Figure 5 of the Test Report shows 3.83k + 140 ohms.  This sets the charge current to approximately 79mA.

    For the bq51003B, the source meter is set below 5V but must be current limited below 75mA.  

    Regards,

    Dick