UC2525ADWTR Integrated Circuits (ICs)

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UC2525ADWTR is a versatile and high performance dual monolithic buck PWM switching regulator that is integrated in the PMIC (Power Management IC) family. Specifically, it is classified as the type of “voltage regulators and DC-DC switching controllers.” In this article, the principle of operation and application field of the UC2525ADWTR will be discussed.

Introduction

UC2525ADWTR is an integrated power management IC (PMIC) developed by Texas Instruments. It is mainly used in applications such as DC/DC converter and on-board power conversion. It is worth noting that Texas Instruments claim for it to be “optimized for low-cost and space-saving designs” since it is designed in a PowerPAD™ package that is just 0.75mm high.

UC2525ADWTR is a stand-alone power supply controller that can directly drive external power transistors. In other words, the external transistors act as a bypass switch to conduct power from the input power source to the load. The main characteristics of the UC2525ADWTR include:

• Operating voltage range: 4.5 to 40 V
• One logic-level feedback pin for each output
• External synchronization of switching frequency
• Output current up to 3 A with short-circuit protection
• Wide operating temperature range from -40° to +125°C

Working Principle

The UC2525ADWTR follows a buck PWM (Pulse Width Modulation) architecture, meaning that the buck converter turns on and off to regulate the voltage at the output. In other words, the internal oscillator is used to control the high- and low-time of the current being delivered to the load. This creates a repeating, square-wave output voltage which is proportional to the duty cycle. Through the duty cycle, the output voltage can be adjusted to the desired level.

The UC2525ADWTR comes with two monolithic power transconductance amplifiers (PTAs). These PTAs are used to regulate the output voltage from a buck converter by controlling the high- and low-times. The basic function of the two PTAs is:

• Two PTAs regulate the output voltage
• The PTAs operate as current amplifiers
• The output current is controlled by the external transistors
• The feedback voltage is compared to a reference voltage to adjust the duty cycle

These PTAs have an open-loop error-amplification stage in addition to a gain-control loop, resulting in an overall error $E_{overall}$ that depends on the reference voltage and the input and output voltages.

In summary, the UC2525ADWTR consists of two PTAs, and it uses them to regulate the output voltage from a buck converter by controlling the high- and low-times. The feedback voltage is compared to a reference voltage to adjust the duty cycle. This helps maintain a stable output voltage at the desired level.

Applications

The UC2525ADWTR can be used in a wide range of applications such as DC/DC conversion and on-board power conversion. Specifically, it is suitable for automotive and industrial applications, especially when it is vital to save valuable board-space while meeting specifications in terms of power conversion.

In automotive applications, the UV2525ADWTR can be used in a wide range of applications such as power windows, lighting systems, and engine control units. In industrial applications, the UC2525ADWTR can be used in HVAC (Heating, Ventilation, and Air-conditioning) systems, lifting and conveyor systems, and water treatment systems.

In addition, the UC2525ADWTR provides many protection functions to ensure the safety of the system. Specifically, it includes programmable short-circuit protection, adjustable maximum current limit, adjustable off-time and over-voltage protection. All these features contribute to a robust and reliable operation.

Conclusion

In conclusion, the UC2525ADWTR is a versatile and high performance dual monolithic buck PWM switching regulator that is integrated in the PMIC (Power Management IC) family. Specifically, it is classified as the type of “voltage regulators and DC-DC switching controllers.” It can be applied in various automotive and industrial applications, while providing many protection functions to ensure system safety. As a result, UC2525ADWTR can be relied on to ensure robust and reliable operation at a reliable cost, and it is indeed a strong addition to Texas Instruments’ power management IC range.

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