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BQ79616-Q1: Rbias resistor value when using external FET for cell balancing

Howard Zou
Genius 12365 points
Part Number: BQ79616-Q1

Hi,

what's the recommended Rbias resistor value and Rgate value when using external FET for cell balancing?

  • +1
    TI__Intellectual 2780 points

    Hi Howard,

    The value of Rbias depends on the turn-on threshold voltage of the external FET, where the Ibias current multiplied with Rbias needs to generate Vgate-source > Vth in order for the FET to turn on.  For example if you set the Ibias current at 10mA, an Rbias resistance of 200 Ohm will give a Vgs = 2V. If the used external FET has a 1.8V threshold voltage, this will be sufficient to turn the FET on.

    The Rgate and Cgate are optional and these determine the external FET turn-on / turn-off time delay as per the folrmula: t_delay = 2* Pi * Rgate * Cgate.

    Regards,

    Viktor.