Fairchild intros 650 V green mode buck switches

SAN JOSE, USA: Home appliance, industrial motor and smart meter applications require solutions that provide low standby power in order to achieve energy efficiency for the end user.

At the same time, designers need power scalability to increase the power rating of a device for additional system functionality while simplifying designs. To meet this challenge, Fairchild Semiconductor developed the FSL306 and FSL336 650 V Green Mode AC Buck Switches.

These devices offer burst-mode operation with the low available operating current (250 µA) that helps to reduce standby mode power consumption for increased energy efficiency. Power scalability from 0.5 W to 3 W (FSL306) through the adjustable current limit pin helps simplify designs and reduce design time.

The FSL306 and FSL336 provide higher reliability through rich protection features, such as a Safe Auto Restart Mode. After a fault condition, the switch waits 650 ms before restarting. This feature reduces the stress on the system during a long-term fault, improving system reliability.

These devices combine a PWM controller and a discrete MOSFET in a single package. A high-voltage regulator enables operation without the need for an auxiliary bias winding. Using a built-in error amplifier, the FSL306 and FSL336 provide direct feedback without a shunt regulator. This helps to reduce the overall bill of material cost while saving board space.