TPS566235: Question for TPS566235 VBST pin resistor

Hi Experts,

Our customer is using TPS566235 on their board and are facing some EMI issues. We are trying to add a series resistor with BST cap which can have some improvements. Now we are using a 3.3ohm resistor for R1 in below schematic. Our question is, what's the maximum resistance we can add on the VBST pin? Is 3.3ohm OK for our device?

Thanks.