Continuous gate drive for high side mosfet using ir2110
While it is possible to do what you're trying to do, it's typically not useful for driving PMDC motors, where 100% duty cycles aren't necessary to get good performance. 

The only situation in which a continuous-on high side would be useful is if you simply must have a bit of extra speed from the motor, and are unable to substitute any of the electromechanical components (the motor, transmission, etc.) to get it.

That said, TI provides a somewhat more digestible app note on the same topic: http://www.ti.com/lit/an/slva444/slva444.pdf

One last thing: make sure that you provide adequate recirculation diodes. If you are using FETs that are meant for this purpose, you may be able to rely on their body diodes (refer to the datasheet to make sure they're beefy enough) or you can optionally turn on the low side FET to let it conduct when the high side FET is off.