UCC2818N

Overview

The UCC2818N is a BiCMOS power factor preregulator controller manufactured by Texas Instruments. It operates in average current mode to provide high power factor and low total harmonic distortion for AC-DC converters. The device supports a fixed switching frequency of 250 kHz and functions within an operating temperature range of -40°C to +85°C. It is housed in a PDIP-16 through-hole package, designed for robust performance in universal AC input systems requiring efficient power management.

Feature Summary

• Implements average current mode control for precise regulation
• BiCMOS technology ensures stable operation across wide voltage ranges
• Integrated protection features enhance system reliability

Applications

• Universal AC input power supplies
• Offline battery chargers
• Industrial power conversion systems

Procurement Notes

Verify the specific suffix 'N' corresponds to the PDIP-16 through-hole package variant when sourcing. Confirm that the required operating temperature range aligns with the specified -40°C to +85°C limit. Ensure compatibility with existing PCB layouts designed for through-hole mounting rather than surface-mount alternatives.

Selection Notes

Select this component for applications requiring through-hole assembly and fixed-frequency operation at 250 kHz. It is suitable for designs prioritizing simplicity and robustness over programmable frequency options found in other series members. Consider thermal management requirements associated with the PDIP-16 package for higher power implementations.

Part Context

This part belongs to the UCC2818A family of power factor correction controllers. While similar devices offer variable frequency or surface-mount packages, the UCC2818N specifically provides a through-hole solution for legacy or high-reliability board designs. It shares core control architecture with the broader UCC2818 series but differs in packaging and fixed frequency characteristics.

Replacement Considerations

UCC2818AD (SOIC-16), UCC2818DTR (SOIC-16 Reel). Verify package compatibility and lead configuration before substitution.