L5974DTR

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Introduction

The L5974DTR is a high-voltage DC-DC synchronous step-down switching regulator that can provide up to 4A of continuous output current from an input voltage as high as 60V. This device is housed in a small (6.0mm × 6.0mm × 2.0mm) thermally-enhanced epoxy-pak package and is highly efficient, making it suitable for a wide range of applications in areas such as industrial, automotive, and medical.

Application Field

The L5974DTR is a versatile device that offers a wide range of applications due to its compact size, high efficiency, and wide input voltage range. This device is primarily used in industrial and automotive applications such as voltage regulators, DC-DC converters, point-of-load converters, and medical/portable devices. It is also used in battery-powered systems, large motors, and general-purpose power supplies.

The L5974DTR is capable of providing up to 4A of continuous current from an input voltage up to 60V, and it operates from an adjustable output voltage ranging from 0.8V to 58V. The device also features an external synchronization capability that allows it to be synchronized with a host system’s clock. The external synchronization frequency range is from 50kHz to 800kHz, providing a wide range of possible operating frequencies. This device is also very efficient, with efficiencies of up to 95%, making it an ideal choice for a wide variety of applications.

Working Principle

The L5974DTR uses a switched-mode operation to step-down an input voltage to the desired output voltage. Basically, this device is composed of two components: an inductor and a switching transistor. The input voltage is applied across the switching transistor, which switches ON and OFF rapidly according to the predetermined frequency, allowing current to pass through the inductor. As current passes through the inductor, a magnetic field is created, which stores energy. When the transistor switches OFF, the magnetic field collapses, releasing the stored energy and maintaining a constant output voltage despite fluctuations in the input voltage. This device is capable of operating at a wide range of frequencies, which can be adjusted via external synchronization.

In addition to its stepped down output, the L5974DTR also features a wide range of protection features such as over-voltage and over-temperature protections, as well as cycle-by-cycle current limiting. These features ensure safe operation, making it suitable for use in harsh conditions.

Conclusion

The L5974DTR is a highly efficient and versatile switch-mode step-down DC-DC switching regulator that can provide up to 4A of continuous output current over a wide input voltage range. It is primarily used in industrial and automotive applications such as voltage regulators, DC-DC converters, and point-of-load converters. Additionally, this device features protection features such as over-voltage and over-temperature protections, as well as cycling current limiting, which make it suitable for use in harsh conditions.

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