UC28023DWR Integrated Circuits (ICs)

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UC28023DWR Application Field and Working Principle

Introduction

UC28023DWR is one of the most popular switching controllers listed under PMICs (Power Management Integrated Circuits) product category by Texas Instruments. It is a programmable, fixed-frequency, step-down current-mode switching controller with integrated MOSFET drivers configured in a space-saving 10-pin WSON package. Under the Voltage Regulators - DC DC Switching Controllers category, this product is designed to offer high efficiency, fast transient response, low start-up current, and high step-down ratio to the user. This article will deal with the application field and working principle of UC28023DWR.

Application Field

The UC28023DWR is an ideal switching controller for off-line and dc-to-dc converter applications, including ac adapters, telecom line cards, and low-voltage/high-current microprocessor core supplies. It has selectable operating frequency and over-temperature protection (OTP) to ensure robust designs. The product suits applications that need high efficiency, fast transient response, low start-up current, high step-down ratio and space-saving packages. It is usually used for fixed switching frequency operation with a maximum of 500 kHz, which makes it suitable for higher frequency operation, such as ac adapters and telecom line cards.

Working Principle

The UC28023DWR is a current-mode control step-down switching controller. It is based on the continuity equation which is used to calculate the sum of inductor current and output diode current being equal to the sum of input current and output current. In addition to that, it has internal over-temperature protection circuit that turns off the output stage when the junction temperature is greater than a certain limit. Furthermore, it has current mode control design for high accuracy and reliability, which minimizes the overshoot at light load for better load regulation.

In the UC28023DWR switching controller, the current-mode control circuit has a logic-level MOSFET gate driver with a peak current limit of 800mA. This provides an optimal combination of both low R DS(ON) for efficiency and low gate drive for low power consumption. The product has low ON resistance (R DS(ON)) MOSFET drivers with independentGate-ON logic and using a P-channel MOSFET, it can operate from input voltages up to 450V. Also, with its wide operating range, it can meet the voltage requirements of almost any application.

The UC28023DWR is also equipped with programmable features like soft-start, frequency foldback, circuit spread spectrum and over current protection. With its ultra-low start-up current, it can reduce the inrush current of the power supply, reducing the system’s total power consumption. Furthermore, its robust architecture ensures superior system reliability with high-temperature and high-voltage tolerant devices.

Overall, the UC28023DWR offers an optimal solution for a broad range of applications. It is the perfect solution for applications that require high efficiency, fast transient response, low start-up current, high step-down ratio and space-saving WSON packages.

Conclusion

UC28023DWR is a highly efficient, fast responding and reliable current-mode control step-down switching controller. With its extended operating range, fast transient response and wide-range input, it is suitable for all off-line and dc-to-dc converter applications, including ac adapters, telecom line cards, and low-voltage/high-current microprocessor core supplies. Its highly advanced features make it the optimal choice for the applications mentioned above.

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