13.9 Bootstrap Inputs (VBA, VBB, VBC)

High-side MOSFET driver bias. Connect the VBA, VBB and VBC pins between the bootstrap charge pump diode cathode and the bootstrap charge pump capacitor. The VBOOT output is used to provide the bootstrap supply voltage at the diode anodes. The phase signals are connected to the other side of the bootstrap charge pump capacitors. The bootstrap capacitors charge to VBOOT when the phase signals are pulled low by the low-side drivers. When the low-side drivers turn off and the high-side drivers turn on, the phase signal is pulled to HVDD, causing the bootstrap voltage to rise to HVDD + 12V.