Per TPSM63606 datasheet page 18 equation 6, the switching frequency calculation is based on VIN and VOUT. For example, when VIN = 12V and VOUT = 7.5V, the calculated switching frequency is ~700kHz.
However if I refers to page 16 Table 6-1, the suggest switching frequency is 1.2MHz to 1.6MHz which is way off from what I calculated.
I also try to generate the same setting in Webench and Webench shows that the Rt is 9.76kohm or translated to 1.31MHz. In this case, Webench result is tally to Table 6-1 but not correlated to Equation 6.
Kindly verify on this.