UC3875NG4

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The UC3875NG4 is an integrated pulse width modulation (PWM) controller and driver intended to provide control signals and power output for a variety of type AC-DC and DC-DC converters. It is an optimal solution for low power off-line power-supply systems thanks to its o high integration, minimum operating parameters and excellent performance.

The UC3875NG4 performs a variety of functions within an off-line switching power-supply system. Its scope of applications ranges from DC-DC converters and AC-DC adapter and battery chargers. Operation of the UC3875NG4 is based on a fixed frequency that is determined by an internal oscillator.

Overall, the UC3875NG4 application field is generally related to PMICs. It is especially ideal for PMICs focusing on AC-DC and DC-DC converters, and offline switchers. It can be used to build a comprehensive power-management solution for an electronic device that requires low-voltage DC conversion and regulation in a variety of performance-sensitive applications.

The working principle of the UC3875NG4 is based on the internal oscillator that operates the Pulse Width Modulation (PWM) controller to provide the switching control signals for the power stage of the AC-DC and DC-DC converters. The oscillator sets the PWM frequency for the Switching Frequency (SF) and the Synchronous Rectifier (SR) controls.

The UC3875NG4 offers great flexibility and system design simplification. The circuit consists of an internal oscillator and logic gates that generate the PWM control signals for the switch-mode power supplies. It also comes with a differential amplifier circuit to detect the output voltage, a reference voltage and a temperature sensor. These allow the UC3875NG4 to perform self-compensation and protection functions.

Moreover, the UC3875NG4 includes various protection circuitry. For example, the overload protection prevents excessive current and the overvoltage protection prevents the output voltage exceeding the voltage of the rated output current. In addition, it offers short-circuit protection, so that the circuit can automatically recover from a short-circuit situation. It also includes circuit protection, allowing it to automatically shut down during fault conditions.

The UC3875NG4 provides an enhanced system performance by enabling its Low RDS(on) power-MOSFETs to operate in the resonant-current mode under fixed-frequency control. This can provide higher efficiency, less switching noise and high power-supply stability.

In addition, the UC3875NG4 has an internal low-loss current control. This is a feature with few advantages: internal soft-start, a wide-range current sharing and an accurate voltage control that can improve the transient response and dynamic performance of the system.

The low operating power requirements of the UC3875NG4 enables it to be used in professional power management applications. Its high level of integration and low operating costs make this product an ideal selection for a variety of applications.

The UC3875NG4 is a versatile and reliable integrated controller and driver for a variety of switching power supplies, especially those related to AC-DC and DC-DC converters as well as offline switchers. Its ability to provide accurate current sharing and wide-range linear current control add to its vast list of features. High system level performance and low power consumption, together with its excellent protection features, make the UC3875NG4 a great choice for professional power-supply designs.

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