Using Dual [High Side/Low Side] Isolated Gate Drivers
If you need continuous (or very long, aka low frequency) high side drive, isolated makes it easier since you can more easily use a floating gate drive supply. Also works if it is not a half-bridge and is just a high-side switch with no low-side switch.
Separate high-side/low-side drivers tend to be made with boostrapping caps and diodes for the high side supply which is cheaper but cannot do 100% duty cycle. In this scheme, the high-side REQUIRES a low-side switch so it must be a half-bridge. The low-side of the half-bridge must periodically turn on (usually through normal operation) to allow a current path to refresh the bootstrap cap. They can be adapted for continuous gate drive with charge pumps and such which is more complicated but cheaper than a floating supply.
Note: a half-bridge is one half of an H-bridge. The 'H' in H-bridge is the shape of the circuit and does not stand for &quot;half&quot;.