Is it possible to only use high side driver of fet driver ic?
Is it possible to only use high side part of IR2103 mosfet driver ic




You can: -


Use the bottom only
The top only
Both as half a H bridge
Not use both simultaneously (and independently) because of the shoot through protection prevents this (thanks to @StainlessSteelRat for pointing this out): -




The lower side MOSFET connection is a high impedance with a few nF of capacitance and leaving it open circuit won't cause problems.