A floating bias supply, such as UCC12041-Q1, can bias the high side instead of a bootstrap circuit. These floating bias supplies reference HS and keep Cboot consistently at the set voltage, even if HS goes negative. Floating bias supplies bypass of the overcharging issue entirely and allows for 100 percent duty cycle operation of the driver.

The bias supply option solves the problem but is potentially costlier. A bias supply is more expensive than a bootstrap circuit. Therefore, using a bias supply is rare in non-isolated gate drive circuits.