UC3874N-2

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UC3874N-2 Application Field and Working Principle

UC3874N-2 is a DC-DC Switching Controller from the PMIC - Voltage Regulators - DC DC Switching Controllers family and a member of the UC3870 series. Its main application is for use in converters for the control of current and the protection of power supplies.

UC3874N-2 is characterized by an excellent soft start feature that provides superior performance and reliability over traditional hard-start techniques. In addition, it contains proprietary circuitry to provide adjustable voltage from a line of input, a flexible operating temperature range, and a wide variety of output load conditions.

It also features high frequency operation, excellent over-voltage protection, and adaptive frequency modulation (AFM). AFM allows the controller to automatically adjust the switching frequency to reduce input ripple and increase the efficiency of the regulator.

In addition, it offers protection against input power overload and open-loop operation. The input voltage range for this controller is 4V to 25V and its output current can range from 0A to 2.5A. Thermal shut-down protection is also included, which ensures that the output voltage remains at a safe level when the temperature gets too high.

The operation of UC3874N-2 is based on a closed loop feedback regulation circuit. It contains two inputs, one of which is used to measure the output voltage. The other is connected to a voltage reference source. The controller compares the measured output voltage with the reference source and adjusts its output accordingly.

The controller also contains an integrated on-chip current limiter and a voltage source level-shifter that controls the output current limit. This makes it possible to limit the peak current during the startup period of a converter. The output is further protected by means of an over-voltage protect (OVP) circuit, a low voltage detect circuit, and an under-voltage protect (UVP) circuit.

UC3874N-2 is especially suited for applications such as battery chargers, DC-DC converters, power supplies, and other high-efficiency applications. This controller is also capable of driving external power MOSFETs and is available in a variety of packages.

In summary, UC3874N-2 is a reliable DC-DC Switching Controller from the PMIC - Voltage Regulators - DC DC Switching Controllers family. It features a soft start feature, adjustable operating temperature range, adjustable output load conditions, high frequency operation, excellent over-voltage protection, and adaptive frequency modulation. A closed loop feedback regulation circuit allows it to provide precise output voltage regulation. Additionally, it features an integrated current-limiter circuit and is available in a variety of packages. It is especially suited for battery charging, DC-DC conversion, and power supply applications.

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