Hi team,
Could you please advise the side effect of adding ground network to prevent reverse battery condition?
I would especially would like to know the equation to estimated the current limit value set by Rilim shifted due to the Ground diode Vf variation.
It is described in the datasheet as below in red.
As far as RLIM ground is connected to the device ground, I think Ground diode Vf variation should not affect the current limit value, is my understanding correct?
Ground Diode: A diode is needed to block the reverse voltage, which also brings a ground shift based on
the forward voltage of the diode. The ground diode must be ≤400 mV to have full current limit capability. If
the forward voltage becomes higher, the current limit can also increase from what the RILIM resistor is set to.
Additionally, the diode must be approximately 200-V reverse voltage for the ISO 7637 pulse 1 testing so that
it does not get biased.
regards,
