LM2674N-12

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LM2674N-12 Application Field and Working Principle

The LM2674N-12 is an improved version of the popular LM2674 switching voltage regulator series developed by National Semiconductor. It includes advanced features such as internal current measurement, output voltage slew rate control and output impedance/capacitance setting to better manage signal integrity in high-speed data processing circuits. This improved voltage regulator series is suitable for a wide range of applications, including portable electronics, medical imaging, defense, mining, and LED lighting.

Applications of LM2674N-12

The LM2674N-12 is suitable for a variety of power supply applications. It is suitable for supplying power to logic, microprocessor, memory and other circuitry where high efficiency, minimal noise, and fast transient response are expected. Typical application field includes:

• CPU core voltage regulator
• Data communication circuits and PoE
• Terminal and telecom devices
• Fiber optic transmission and camera circuits
• Wireless data transmission and remote control
• Power supply for medical equipment and instrumentation
• Consumer electronics
• High-end AC/DC power supplies

Working Principle of LM2674N-12

The LM2674N-12 is a monolithic integrated circuit used for DC-DC conversion. It uses an adjustable current-mode topology with an internal high-speed switching transistor to regulate positive or negative output voltages. The switch is always on and off to drive a synchronous rectifier or pass element in order to regulate the output voltage.

The LM2674N-12 regulates a current signal reference from an external resistor placed between the output voltage sense pin and the output ground pin. Like many current mode controllers, the output voltage signal is accomplished by sensing a portion of this current and using this signal as a feedback signal for output regulation. The current mode controller power stage is designed to provide a minimum of 80% efficiency and to achieve a fast transient response.

This integrated circuit also provides internal current sensing, over-temperature sensing, over-voltage sensing, over-current protection and enable function. This chip also has an adjustable soft-start (enabling low inrush current) function to limit startup current. The input under-voltage (UV) protection circuit shuts down the regulator\'s power stage when the input voltage drops below the specified level.

The voltage control of the LM2674N-12 is very precise, allowing the user to feed a less precise voltage reference into the circuit. This will make it possible to use the device in systems where precise voltage control is required. In addition, the LM2674N-12 can also regulate a wide range of voltages, allowing the user to set the output voltage while still regulating the output.

Conclusion

The LM2674N-12 is an improved version of the popular LM2674 switching voltage regulator series developed by National Semiconductor. It includes advanced features such as internal current measurement, output voltage slew rate control and output impedance/capacitance setting to better manage signal integrity in high-speed data processing circuits. This improved voltage regulator series is suitable for a wide range of applications, including portable electronics, medical imaging, defense, mining, and LED lighting.

The LM2674N-12 is a monolithic integrated circuit used for DC-DC conversion. It uses an adjustable current-mode topology with an internal high-speed switching transistor to regulate positive or negative output voltages. This integrated circuit also provides internal current sensing, over-temperature sensing, over-voltage sensing, over-current protection and enable function. The voltage control of the LM2674N-12 is very precise, allowing the user to feed a less precise voltage reference into the circuit and still achieve precise voltage regulation.

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