Hi, The LTC3891 datasheet unfortunately doesnt give the current sense gain. ie, the amount by which the current
sense voltage is multiplied, so as to increase it. Due to this, it is not possible to calculate the
transresistance for any Buck converter made with LTC3891...and because of that, its not possible to do a Bode Plot
calculation for the LTC3891, because the transresistance is a needed parameter in the calculation of the control to output transfer
function.
As you know, the transresistance is the voltage coming off the sense resistor divided by the current that caused it by flowing through it.
As such, do you know how we can find out the current sense gain for the LTC3891?
They have LTpowerCAD but sometimes its good to have your own checker...specially since you can extend your own to include any output LC filters added in.