UC2854ADWTR

Overview

The UC2854ADWTR is a power factor correction controller manufactured by Texas Instruments. It integrates a high-voltage startup circuit, an error amplifier, a multiplier, and a PWM comparator. The device operates from a wide supply voltage range and includes undervoltage lockout protection. It supports both continuous and discontinuous conduction modes for boost PFC applications. The component is housed in a SOIC-16 surface-mount package.

Feature Summary

• Integrated high-voltage startup circuit eliminates external bias winding requirements
• Built-in multiplier enables precise sinusoidal line current shaping
• Includes undervoltage lockout with hysteresis for reliable operation

Applications

• Power factor correction in AC-DC converters
• Continuous conduction mode boost PFC circuits
• Discontinuous conduction mode PFC designs

Procurement Notes

Verify the suffix 'DWTR' confirms the tape-and-reel packaging format and the 'A' grade indicates automotive or extended temperature specifications if applicable. Confirm the manufacturer marking matches Texas Instruments standards to avoid counterfeit components. Check the date code for freshness and storage conditions compliance.

Selection Notes

Select this component when designing active power factor correction stages requiring integrated startup functionality. It is suitable for applications needing precise current shaping without external complex bias networks. Consider thermal performance within the SOIC-16 package for your specific power dissipation requirements.

Part Context

This part belongs to the UC2854 family of power factor controllers. It serves as a complete solution for single-stage PFC designs. The device simplifies design by integrating multiple functional blocks typically found in discrete implementations. It is widely used in consumer electronics and industrial power supplies.

Replacement Considerations

Direct substitutes include other UC2854 variants such as UC2854AN or UC2854D depending on package and temperature grade requirements. Verify pin compatibility and electrical parameters before substitution.