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UCC28950 delay time

delay time setting DELAB, for DELCD
I have connected a resistor DELAB, to DELCD terminal
And then I will set the delay time
Data-sheet (3), equation (4), delay time when Rab = 13kΩ, 90kΩ of has been also shown in Figure5, Figure6.

The maximum amount of delay time at the time
whenKA=0
Rab=13kΩ→delay time 438ns
Rab=90kΩ→delay time 3us
Figure5maximum delay time 250ns
Does not match the maximum value of 1.7us Figure6.

Why do you mismatch occurs?