I am designing an H-bridge with an N-channel MOSFET to control a 12V - 1.35A DC motor. The H-bridge will be controlled with the digital outputs of an Arduino. I did some research and found that I need to use a bootstrap circuit, which from what I understood is to improve the linearity of the MOS switch (on resistance of transistor) by making sure that the signals from the source and the gate of the NFET follow each other. For this, a capacitor is added between the gate and the source of the transistor, so that the gate and source signals follow each other.
Circuit diagram
I found a bootstrap circuit and included it in the H-bridge design, but didn't end up understanding how the boostrap works.
Thanks in advance for the help.
Circuit diagram
I found a bootstrap circuit and included it in the H-bridge design, but didn't end up understanding how the boostrap works.
- Where is the capacitor supposed to find its way to ground?
- How do I calculate the value of the boostrap resistor and capacitor?
- Is the circuit correct? It works in the simulator, but I don't know if it works in real life.
Thanks in advance for the help.