Texas Instruments

UC3875N

UC3875N Description

The UC3875N from Texas Instruments is a high-performance full-bridge PWM controller designed for offline AC/DC power conversion applications. Housed in a 20-pin DIP package, this IC operates within a 9.5V to 20V supply range and features a start-up voltage of 10.75V, ensuring reliable initialization. With a switching frequency capability of up to 1MHz, it supports frequency control, soft-start, and synchronization for precise power management. The device is RoHS3 compliant and rated for 0°C to 70°C operating temperatures, making it suitable for industrial and commercial environments.

UC3875N Features

• Advanced Control: Integrates frequency control, soft-start, and sync for flexible power stage management.
• Robust Protection: Includes current limiting to safeguard against overloads.
• High Duty Cycle: Supports 100% duty cycle for efficient power delivery.
• Wide Supply Range: Operates from 9.5V to 20V, accommodating diverse power rails.
• Through-Hole Mounting: 20DIP package ensures easy integration into legacy systems.
• 1MHz Switching: Enables compact magnetics and faster transient response.

UC3875N Applications

The UC3875N excels in high-power offline converters, including:

• Telecom Power Supplies: Delivers stable voltage regulation for base stations.
• Industrial SMPS: Ideal for server PSUs and motor drives requiring full-bridge topologies.
• Medical Equipment: Ensures reliable operation in isolated power systems.
• Renewable Energy: Used in solar inverters for efficient DC-AC conversion.

Conclusion of UC3875N

The UC3875N stands out for its versatile control features, high-frequency operation, and robust protection, making it a preferred choice for demanding offline power applications. While classified as Last Time Buy, its performance and reliability ensure continued suitability for legacy designs. Engineers seeking a full-bridge controller with sync capability and soft-start will find this IC a compelling solution.