UC3825N

The UC3825N is a high-performance, voltage-mode PWM (Pulse Width Modulation) controller designed for use in a variety of power supply applications. Manufactured by Texas Instruments, this integrated circuit is particularly well-suited for switch-mode power supplies (SMPS), including both isolated and non-isolated designs.

Key Features:

1. Voltage Mode Control: The UC3825N operates in voltage mode, which allows for stable control of the output voltage with minimal external components. This makes it ideal for applications requiring precise voltage regulation.

2. Wide Input Voltage Range: The device can handle a broad input voltage range, typically from 10V to 30V, making it versatile for different power supply designs.

3. High Switching Frequency: The UC3825N supports high switching frequencies, often up to 500 kHz, which enables the design of compact power supplies with smaller inductors and capacitors.

4. Integrated Features: The controller includes several integrated features such as a soft-start function to limit inrush current during startup, a dead-time control to prevent cross-conduction in half-bridge configurations, and a frequency compensation network to enhance stability.

5. Error Amplifier: It has an internal error amplifier that allows for easy feedback loop design, ensuring that the output voltage remains stable under varying load conditions.

6. Output Drivers: The UC3825N includes totem-pole output drivers capable of driving external MOSFETs directly, which simplifies the design and reduces the need for additional driver circuits.

7. Thermal Shutdown and Overcurrent Protection: The device features built-in thermal shutdown and overcurrent protection mechanisms, enhancing reliability and safety in power supply applications.

8. Package Type: The UC3825N is typically available in a 16-pin dual in-line package (DIP) or surface-mount package (SOIC), facilitating easy integration into various circuit designs.

Applications:

The UC3825N is commonly used in applications such as:

• DC-DC converters
• Power supplies for computers and telecommunications equipment
• Battery chargers
• Industrial power supplies
• LED drivers

Conclusion:

Overall, the UC3825N from Texas Instruments is a robust and flexible PWM controller that provides designers with the tools needed to create efficient and reliable power supply solutions. Its combination of integrated features, high performance, and ease of use makes it a popular choice in the power electronics industry.