STP11NM50N

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STP11NM50N is one of the most commonly used MOSFET (metal–oxide–semiconductor field-effect transistor) in the power device market. As a part of STMicroelectronics’ N-channel PowerMESH™ II family of MOSFETs, this power MOSFET is known for its high current handling capabilities, low on-state resistance, and robust ESD (electrostatic discharge) capabilities. This article will discuss the main application fields as well as the working principles of STP11NM50N.

Application Field

The STP11NM50N is commonly used in general purpose switching applications and DC-DC conversion circuits. At a maximum drain–source voltage of 500 V, it can handle an on-state current of up to 11 A, making it suitable for a wide range of applications including telecom, HVAC, and industrial products like welding equipment, and portable sound systems. It is also used to control and monitor the motor speed in powertrain, motor control, and non-driving axle motor control applications. Furthermore, it is an excellent choice for AC/DC rectifiers and battery inverter circuits.

Other applications include dc-dc converters, power supplies, and power supply fault protection circuits. In addition, it has excellent ESD protection capabilities and is thus suitable for use in handheld and portable devices. STP11NM50N can also be used in circuits that require higher power efficiency and improved power quality.

Working Principle

MOSFETs are four-terminal semiconductor devices that combine the characteristics of a metal oxide semiconductor (MOS) device and a field-effect transistor (FET). As with all FETs, STP11NM50N operates by altering the width of the channel between its source and drain terminals, resulting in a change of drain-source current. The amount of current depends on the voltage applied between the gate and source terminals. When a small voltage is applied to the gate, the MOSFET is “ON”, allowing current to flow between the source and drain. When the voltage is reduced to 0V, the MOSFET is “OFF”, preventing current from flowing between source and drain.

Examples of how STP11NM50N is used in various applications include its use in dc-dc converters, power supplies, and power supply fault protection circuits. In a dc-dc converter, the MOSFET is used to control the power being fed to the circuit. By using the MOSFET to control the voltage applied to the converter, the circuit can either be supplied with a regulated voltage or the output can be varied to control the load. In a power supply, the MOSFET is used to regulate the current flowing through the circuit. The amount of current can be regulated by varying the voltage applied to the gate of the MOSFET.

In a power supply fault protection circuit, the MOSFET is used to detect certain fault conditions. When a fault occurs, the voltage on the drain will spike, triggering the gate and causing the MOSFET to open, thus shutting down the circuit.

Another application of the STP11NM50N is in the control and monitoring of motor speed in powertrain, motor control, and non-driving axle motor control applications. The MOSFET is used to control the amount of current being fed to the motor to achieve a desired speed. By monitoring the current flowing through the MOSFET, the motor speed can be controlled more accurately.

Conclusion

In conclusion, the STP11NM50N is a powerful and reliable MOSFET ideal for a wide range of general purpose switching applications and DC-DC conversion circuits. Its high on-state current handling capabilities and robust ESD protection make it suitable for use in handheld and portable devices. It is also used in motor control applications, power supply fault protection circuits, and AC/DC rectifiers. Understanding STP11NM50N’s application field and working principles can help engineers use this power MOSFET more efficiently.

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