Even if the SS behavior is, in theory, not affected by the asynchronous operation, it is still good practice to check whether the device is starting up properly. Start-Up Behavior and Soft-Start Pin shows a snapshot of the signal on the SS pin. As is visible, the output voltage (in yellow) first follows the input (in orange), and then ramps up to the desired output (24V in this case). On the top of the picture (in blue), the switch node of the converter is visible.

Figure 4-2 Start-Up Behavior and Soft-Start Pin