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Inquiry regarding wireless power supply between bq500211A and bq51013B

Atsushi Okui
Genius 4015 points
Other Parts Discussed in Thread: BQ51013B, BQ500211A, BQ51013BEVM-764

Hello, all

Now we have one inquiry regarding power supply between bq500211A and bq51013B from our customer.

They are evaluating their own design board which is based on BQ500211AEVM-210 and BQ51013BEVM-764, except resonant frequency is changed to 115kHz by means of changing capacitor and inductor value.

When testing on above configuration, switching frequency on bq500211A side is forced to 205kHz fixed. 

Please let us know what could be taken in consideration to resolve this issue.

We thank you in advance for your information.

Best regards,

  • 0
    TI__Guru 65846 points

    This could possibly be caused by Dynamic Power Limiting circuit (DPL).  Check the V-Sense (Pin 46) input and the I_Sense (Pin 42) input and circuits.  If the V-Sense is low unit will try to increase freq to bring this voltage up.