ADP1047 some questions

Hi ,

Got some questions , would you kindly help to reply me ? see the list as below . Thanks

1. Current sensing ADC of current loop: Clear description, Gain? What’s the level shift current source? ……{page 12, Figure 7}
2. How to get IL? ……………………………..{page 17, Figure 14}
3. We found that the hysteresis of Brown-Out is very poor. How to improve it? …………..{page21, Figure18}
4.      How to use small value resistance of current sense Resistor in PFC circuit when using ADP1048 ? (PFC = 1200W)