TPS25921A: Turn on and off delay

Part Number: TPS25921A

Hello team,

Looking at Fig.19 and 20, the turn on and off delay in the datasheet seems to be obtained under the condition Ven = 5.0V.
Is the ton and toff values changed by the enable voltage?

If there is a relation between delay time and enable voltage, please teach me how to calculate the delay time.

Regards,
Taka