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LTC3789 inrush current issue

Hi ADI Expert

I have seen some inrush current issue on LTC3789 when I connect Iosense+- to Vout, (which stated in the datasheet when no output current sense is required)

as you can see in the below pic1

the Vout rose rapidly to around 4V in a very short time that cause the high Iin inrush current


however, if I connected Iosense+- to INTVCC (see pic2)

the inrush current was completely off and the Vout was rising smoothly 


May I know the detail reason for the bad Ith control?



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