Other Parts Discussed in Thread: UCC27714
Can the UCC27289 use on the two switches topology?
There has another power for the HB pin, and the switch turns on together.
thanks and best regards
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The circuit in the UCC27714 can be used, the boot diode shown in the diagram would not be installed, as the UCC27289 has an internal boot diode.
The principle is the driver low side output when turned off turns off the aux transistor (bottom switch) which allows the aux transistor top switch to turn on. The aux switch (top) turning on provides a path for the driver HS to be pulled to ground which provides a charging path for the bootstrap capacitor to charge from VDD through the boot diode.
During the power switch off time, the HS is pulled low allowing the boot cap to charge.