Synchronous Buck Converter Schematic. The on off control is synchronized in order to provide a regulated output voltage and to prevent the mosfets from turning on at the same time. This modification is a tradeoff between increased cost and improved efficiency.
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The basic operation of the buck converter can be illustrated by looking at the two current paths represented by the state of the two switches. The synchronous buck converter is a widely used topology in low voltage high current applications. The on off control is synchronized in order to provide a regulated output voltage and to prevent the mosfets from turning on at the same time.
In pwm pulse width modulation the overall switch time t is kept constant while the turn on time t on of the switch is varied in contrast the switching period time t is varied while the turn on time t on of the switch is kept constant in pfm pulse frequency modulation.
The basic operation of the buck converter can be illustrated by looking at the two current paths represented by the state of the two switches. Synchronous buck converter overview. Continuous and discontinuous modes. The figure shown is an idealized version of a buck converter topology and two basic modes of operation.
