UC2874N-2

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The UC2874N-2 is a high performance DC–DC switching controller. This type of feedback control is used to regulate the output voltage of a power converter. It supports PWM operation for both synchronous and asynchronous buck converter applications. In addition to the standard features such as programmable hysteresis, current limit and soft-start, the UC2874N-2 also offers a wide range of advanced features including temperature protection and current-mode control with a wide range of selectable bandwidths.

The UC2874N-2 is suitable for a wide variety of applications including handheld, laptop and automotive electronic systems. It is designed for high efficiency, high-current output regulation, and low-power operation in switching DC–DC converters. The IC provides the necessary control and protection features needed to maintain optimal output voltage regulation even in the event of short-term load transients.

Application Field

The UC2874N-2 is used in a variety of applications including: DC/DC converters, point of load regulators, automotive systems, computers, wireless communication devices, and portable consumer electronics.

DC–DC converter applications are the most common use of the UC2874N-2. The high accuracy regulate the output voltage of the converter even in the case of short term load transients. With the current-mode operation available with the UC2874N-2, it can also be used in synchronous buck applications.

It is also used in point of load (POL) regulators. This is due to the wide range of selectable power management, current limit and hysteresis. This makes the UC2874N-2 ideal for low power applications with end systems requiring extremely tight power management.

Other applications including Automotive systems, Computers, Wireless communication devices, and Portable consumer electronics all benefit from the flexibility of the UC2874N-2. Its wide range of features and high tolerance of short-term load transients makes it an ideal choice for these applications.

Working Principle

The UC2874N-2 works on the principle of feedback control. Whenever the output voltage of a DC–DC converter changes, the feedback loop takes the updated voltage measurement and sends a corresponding current through the shunt resistor. This impulse is then received by an error amplifier which compares the measured voltage to a reference voltage, and adjusts the output accordingly.

The UC2874N-2 also monitors the output current, and can activate a protection circuit if the current exceeds the configured current limit. This process is known as foldback and results in a reduction in output voltage, thus avoiding any damage to the transformer.

The UC2874N-2 also has temperature protection and current-mode control with a wide range of selectable bandwidths, allowing improved designs in terms of dynamic performance and efficiency. With the current-mode control, the UC2874N-2 is able to accurately control the output voltage regardless of changes in input voltage, load or temperature.

Overall, the UC2874N-2 is a high performance and versatile DC–DC switching controller that can be used for a wide range of applications. Its current-mode control and temperature protection, combined with a wide range of selectable bandwidths make it ideal for power management applications requiring extremely tight control.

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