FMX-22S

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A diode array, also known as an array rectifier, is an electronic component used to simplify the design of power supplies, as well as providing protective characteristics by suppressing undesired electrical signals in a circuit. A popular product used in this application is the Fairchild Semiconductor FMX-22S Rectifier Array, which is designed specifically to provide protection and minimized power supply cost. This article will discuss the application fields of the FMX-22S Array Rectifier and its operating principle.

Applications of the FMX-22S Array Rectifier

The Fairchild Semiconductor FMX-22S Array Rectifier is a 4-pin device in a TO-220 package that is used to rapidly discharge stored energy from capacitors, improving the power-on response time of a circuit. It also provides a low forward voltage drop for low power supply cost. The FMX-22S is often used in power supplies and overvoltage protection circuitry, which require fast response times or the ability to handle large current spikes. This makes it suitable for use in laptop computers, power rectifications, power dissipation and adapter circuits, automotive power systems, and telecom system applications.

Operating Principle of the FMX-22S Array Rectifier

The FMX-22S Array Rectifier is a silicon four-pin reverse-blocking triode thyristor (SCR) composed of two NPN transistors, two P-channel MOSFETs and two diodes. The two transistors are connected in series and are wired in a Symmetrical Gate Circuit so that both the forward and reverse turns ratio of the thyristor can be controlled precisely. The FMX-22S also incorporates a built-in snubber circuit that is used to reduce switching losses and reduce the EMI interference level.

The operation of the FMX-22S Array Rectifier can be understood by examining the device’s functional characteristics at high current levels. When the input voltage exceeds a certain threshold, the gate drive turns on the thyristor, allowing current flow from one terminal of the rectifier to the other. This current then passes through the diodes on the other ends of the two transistors. As the gate drive is maintained, the voltage on the rectifier’s anode is decreased, allowing an increased current flow rate. If the gate drive is increased to a level at which the SCR is overdriven, the device will enter a breakdown mode and return to the low voltage drop characteristic.

The snubber circuit of the FMX-22S is used to reduce the amount of current flowing into the load and improve device stability at high current levels, while also reducing the size of the voltage spikes caused by the turning on of the thyristor. This helps to reduce EMI interference, improve thermal performance, and increase power supply efficiency. Additionally, the snubber circuit helps to reduce the amount of power dissipated by the device.

Conclusion

The Fairchild Semiconductor FMX-22S Array Rectifier is a versatile and powerful device that is used in a wide range of applications, from laptop computers to automotive power systems. Its low forward voltage drop, fast response time, and snubber circuit make it an ideal choice for a variety of power supply and overvoltage protection applications. The device\'s working principle is based on the use of two transistors, two P-channel MOSFETs, and two diodes, which work together to provide a low voltage drop and reduce switching losses.

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