I wont make a bridge with IR2101 to drive a BLDC motor, but the IR2101 doesn't polarise the up-side mosfet (Vgs only 3.5V). I use a capacitor between Vb and Vs of 3.3uF (I had also used 200uF but the voltage of polarization is grown but of little). I use as Vcc=15V end the scheme of data sheet. I'm in despair!!! I don't know to do!!! I excuse for my bad English.