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