UC2823Q

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UC2823Q is a kind of DC-DC switching controllers belonging to the group of integrated devices called “Voltage Regulators”, specifically in the “PMIC” family. A PMIC (Power Management Integrated Circuit) is a device used to regulate the supply of an electrical power to achieve maximum efficiency. The UC2823Q is a Monolithic Integrated Circuit also called an IC (or “chip”) that is capable of handling currents up to 5A and voltages up to 28V. It includes multiple features that make it suitable for use in a wide range of applications.

In terms of its applications, the UC2823Q is mainly used in the field of power conversion, in service of various types of electrical power system designs. Its ability to handle large currents, suitability for multiple voltage environments and low power factor, make it a great choice for use in many power systems such as power supplies for equipment, converters for mobile or automotive systems and even industrial power system designs.

The UC2823Q integrates several circuit elements that allow it to work as a DC-DC switching controller in a power converters. The basic architecture of a UC2823Q incorporates several blocks, each one of which has a specific function. At a high-level, the UC2823Q can be divided into 3 main blocks: the Power Switcher (or power stage), the Voltage Feedforward/Reference, and the Control logic/gate Driver.

The Power Switcher is responsible for the power transfer from one voltage level to another. The UC2823Q uses a current sensing technique at the output to detect the output current and modulate the power switch output voltage. It is typically composed of a power switch and an auxiliary switch (typically a low-side power MOSFET). The power switch is the main switching element that handles the load current, while the auxiliary switch gates the current sensing voltage.

The Voltage Feedforward block is responsible for providing the reference voltage level to the Control logic/gate driver. This block contains components such as resistors and capacitors, which enable the UC2823Q to accurately set the output, adjust the operating frequency and regulate the output voltage. The input voltage is fed through a voltage divider network, and the divider output is then compared to the internal reference voltage to set the output.

Lastly, the Control logic/gate Driver block is responsible for controlling the switching action of the power switch. This block contains logic level control signals and is used to activate or deactivate the power switch, which in turns allows for varying the output voltage. This block also provides the necessary drive signals to the auxiliary switch for current sensing, as well as the necessary protection and fault detection circuitry.

The overall working principle of the UC2823Q is based on the modulation of the output current according to the feedback provided by the voltage feedforward and reference circuit. The voltage divider network establishes the input voltage and compares it with the internal reference voltage to set the output. When the output voltage reaches the desired value, the control logic/gate Driver block is triggered and the power switch is turned ON. By modulating the output according to the feedback provided by the feedforward circuit, the UC2823Q ensures a constant output voltage.

In terms of practical usage, the UC2823Q is very useful in many design applications where an efficient regulation of power is required. It can be used in power supplies for industrial and commercial equipment, in mobile and automotive systems, or in industrial power system designs. Its ability to handle large currents, suitability for multiple voltage environments and low power factor, make it a great choice for a wide range of system designs.

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