I found the question that explains logic supply voltage (VDD, VSS) and gate drive supply voltage (VCC) are not isolated. And according to datasheet reference circuit, it seems to be non-isolated between hi-side and low-side supply voltage. So I guess IR2110 can be used with only one voltage source, even though it come form main supply(eg. high side mosfet drain), assuming that I use voltage divider.
Then I have question. When I compose full bridge with two IR2110, can I supply two IR2110 with one voltage? If not, what supply voltage need isolation?
I have rectified AC220(DC 310V). and isolated 5V. If I cannot use IR2110, how can I compose full bridge?