I am designing a H-bridge to drive a motor that is running at 12V / 3A.
To prevent shoot-through I decided to select a IC with integrated dead time - IR2111.
What I got so far is the following circuit (showing just one half of the full bridge to conserve space): What I am curious about is the need for the bootstrap capacitor between \$V_B\$ and \$V_S\$ and the diode as shown in the datasheet:
My understanding is that usually the drain of the high-side MOSFET is connected to a much higher voltage as the supply voltage for the IR2111. To switch the MOSFET a higher voltage has to be generated, therefore the bootstrap capacitor.
But in my case the voltages (drain of the hide-side mosfet and supply voltage of the IR2111) are all 12V. So the voltage is high enough to switch the high-side MOSFET and I do not need the bootstrap capcitor. Am I right?