Synchronous Buck Converter Circuit
One approach is to employ a controller IC with a “fixed dead-time,” which ensures that there is a delay after the top MOSFET is turned-off before the lower MOSFET is turned on. This approach is simple, but has to be implemented carefully. If the dead time is too short, shoot-through may not be averted. If it is too long, the conduction losses increase because during the dead time the body diode of the bottom FET is on. Because of the conduction of this body diode during the dead-time, the efficiency of the system when using this technique depends somewhat on the bottom MOSFET’s body diode characteristics.