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bq500212 PWM frequency

Mahesh Natu
Prodigy 30 points
Other Parts Discussed in Thread: BQ500212A

How PWM frequency in bq500212A EVM is calculated ? i am getting 90KHz at coil terminals but it is not communicating with Reciever.

Thanks

Regards, Mahesh

  • 0
    TI__Guru 65706 points

    PWM is not used the duty cycle is 50%.  The bq500212A will vary its operating freq from 110kHz to 205kHz to change operating point and output power. High freq = low output power and Low freq = High output power.  If you are seeing 90kHz something is very wrong.

    Take a look at the digital drive signals at pin 12 and 13.  During digital ping the freq will be 174kHz.

  • 0 in reply to Bill Johns
    Prodigy 10 points
    Hello,Would the PWM set the freq automatic? Could you explaince for it?Jone
  • 0 in reply to Hwadong
    TI__Guru 65706 points
    Yes operating freq is set automatically ---- the TX will set operating freq to meet the RX requirements. The RX will communicate with the TX using communications packets.
    This info along with other useful info is covered in some article I have written and can be found in the FAQ section of the Wireless Power Forum, please see.
    http://e2e.ti.com/support/power_management/wireless_power/w/wireless_power_faq
    Link to articles
    http://e2e.ti.com/support/power_management/wireless_power/w/wireless_power_faq/2881.faq-bqtesla-wireless-power-articles-links