UC2855AN

Overview

The UC2855AN is a high-performance power factor preregulator controller from Texas Instruments, designed for average current mode operation. It operates within a supply voltage range of 12 V to 20 V and supports a switching frequency of 500 kHz. The device features a 20-pin DIP package and functions across an industrial temperature range of -40°C to +85°C. With a startup current of 150 µA, it offers efficient power management suitable for various AC-DC conversion applications requiring improved power factor correction.

Feature Summary

• Implements average current mode control for enhanced power factor correction performance
• Designed as a high-efficiency power factor preregulator solution
• Supports multiple topologies including Boost, Flyback, Forward, Full Bridge, Half Bridge, and Push-Pull configurations

Applications

• Power factor correction in AC-DC power supplies
• High-efficiency preregulator stages in power conversion systems
• Industrial power management applications requiring improved line regulation

Procurement Notes

Verify the specific ordering suffix and package variant against the official Texas Instruments datasheet to ensure compatibility with your design requirements. Confirm that the component meets all relevant RoHS and environmental standards required for your final product assembly. Cross-reference the pinout and electrical specifications with the latest manufacturer documentation before integration.

Selection Notes

Select this component when average current mode control is required for superior power factor correction compared to peak current mode alternatives. Consider its 500 kHz switching frequency and wide operating voltage range for designs needing robust performance across varying input conditions. Ensure the thermal and physical constraints of the 20-DIP package align with your board layout and enclosure specifications.

Part Context

The UC2855AN belongs to the family of power factor correction controllers from Texas Instruments, engineered to meet stringent efficiency and harmonic distortion regulations. It serves as a critical component in modern power supplies aiming to reduce reactive power and improve overall system efficiency. Its design focuses on simplifying the implementation of high-performance PFC stages in commercial and industrial equipment.

Replacement Considerations

Consult the official Texas Instruments substitution guide or equivalent manufacturer resources for verified compatible replacements. Ensure any substitute part maintains identical pinout, electrical characteristics, and package dimensions to avoid redesign efforts.